{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/adobe/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":8.6,"id":"CVE-2026-34621"}],"_cs_exploited":true,"_cs_products":[],"_cs_severities":["critical"],"_cs_tags":["adobe","acrobat","reader","rce","vulnerability"],"_cs_type":"threat","_cs_vendors":[],"content_html":"\u003cp\u003eAdobe has addressed CVE-2026-34621, a zero-day vulnerability affecting Acrobat DC, Acrobat Reader DC, and Acrobat 2024 versions on both Windows and macOS. This flaw has been actively exploited in the wild since at least December, with initial discovery occurring after a malicious PDF sample named \u0026ldquo;yummy_adobe_exploit_uwu.pdf\u0026rdquo; was submitted for analysis. The vulnerability allows specially crafted PDF files to bypass sandbox restrictions, invoke privileged JavaScript APIs, and potentially execute arbitrary code. Successful exploitation can lead to reading and stealing arbitrary local files. The impacted versions include Acrobat DC and Reader DC versions 26.001.21367 and earlier, as well as Acrobat 2024 versions 24.001.30356 and earlier. This zero-day requires immediate patching across enterprise and personal environments.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker crafts a malicious PDF file containing JavaScript code designed to exploit CVE-2026-34621.\u003c/li\u003e\n\u003cli\u003eThe attacker distributes the malicious PDF via email, web download, or other means.\u003c/li\u003e\n\u003cli\u003eThe victim opens the malicious PDF in a vulnerable version of Adobe Acrobat or Reader.\u003c/li\u003e\n\u003cli\u003eThe vulnerability allows the malicious PDF to bypass sandbox restrictions.\u003c/li\u003e\n\u003cli\u003eThe PDF invokes privileged JavaScript APIs, such as \u003ccode\u003eutil.readFileIntoStream()\u003c/code\u003e, to read arbitrary local files.\u003c/li\u003e\n\u003cli\u003eThe PDF utilizes \u003ccode\u003eRSS.addFeed()\u003c/code\u003e to exfiltrate the stolen data to an attacker-controlled server.\u003c/li\u003e\n\u003cli\u003eThe attacker gains access to sensitive information stored on the victim\u0026rsquo;s machine.\u003c/li\u003e\n\u003cli\u003eThe attacker uses the initial access for further exploitation, such as lateral movement or data exfiltration.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-34621 allows attackers to bypass sandbox restrictions within Adobe Acrobat and Reader, leading to arbitrary code execution and unauthorized access to local files. This could result in the theft of sensitive data, such as credentials, financial information, or intellectual property. Although the number of victims is currently unknown, security researcher Gi7w0rm spotted attacks in the wild that leveraged Russian-language documents with oil and gas industry lures, and the potential impact is significant, especially for organizations that handle sensitive information in PDF documents.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eImmediately update Adobe Acrobat DC and Reader DC to version 26.001.21411 or later, and Acrobat 2024 to version 24.001.30362 (Windows) or 24.001.30360 (Mac) via \u0026lsquo;Help \u0026gt; Check for Updates\u0026rsquo; to remediate CVE-2026-34621.\u003c/li\u003e\n\u003cli\u003eImplement the \u0026ldquo;Detect Execution of Suspicious JavaScript in PDFs\u0026rdquo; Sigma rule to identify potential exploitation attempts within your environment.\u003c/li\u003e\n\u003cli\u003eMonitor file creation events for files matching the name \u0026ldquo;yummy_adobe_exploit_uwu.pdf\u0026rdquo; or similar filenames identified during future investigations.\u003c/li\u003e\n\u003cli\u003eEducate users to be cautious when opening PDF files from untrusted sources and encourage them to verify the sender\u0026rsquo;s authenticity before opening any attachments.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-13T15:37:41Z","date_published":"2026-04-13T15:37:41Z","id":"/briefs/2026-04-adobe-reader-rce/","summary":"Adobe patched CVE-2026-34621, a zero-day vulnerability in Acrobat and Reader exploited since December, allowing malicious PDFs to bypass sandboxes and execute arbitrary code, potentially leading to local file theft.","title":"Adobe Acrobat and Reader CVE-2026-34621 Zero-Day Exploitation","url":"https://feed.craftedsignal.io/briefs/2026-04-adobe-reader-rce/"},{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":["Acrobat Reader DC"],"_cs_severities":["medium"],"_cs_tags":["persistence","adobe","file_creation","hijack_execution_flow"],"_cs_type":"advisory","_cs_vendors":["Adobe"],"content_html":"\u003cp\u003eThis detection identifies a persistence technique where attackers replace Adobe Acrobat Reader\u0026rsquo;s \u003ccode\u003eRdrCEF.exe\u003c/code\u003e with a malicious executable. This allows the attacker to gain persistence, as their malicious file will be executed every time the user launches Adobe Acrobat Reader DC. The rule focuses on detecting the file creation event of a file named \u003ccode\u003eRdrCEF.exe\u003c/code\u003e in the Adobe Acrobat Reader directory. The targeted versions are those using the \u003ccode\u003eRdrCEF.exe\u003c/code\u003e file located within the \u003ccode\u003eAcroCEF\u003c/code\u003e subdirectory. The purpose of this technique is to maintain unauthorized access to a compromised system. This technique was publicly discussed on Twitter as early as 2018.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eInitial access is gained through an existing compromise or vulnerability.\u003c/li\u003e\n\u003cli\u003eThe attacker locates the \u003ccode\u003eRdrCEF.exe\u003c/code\u003e file within the Adobe Acrobat Reader installation directory (e.g., \u003ccode\u003eC:\\Program Files (x86)\\Adobe\\Acrobat Reader DC\\Reader\\AcroCEF\\\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eThe legitimate \u003ccode\u003eRdrCEF.exe\u003c/code\u003e file is either deleted or renamed.\u003c/li\u003e\n\u003cli\u003eA malicious executable is created or copied and renamed to \u003ccode\u003eRdrCEF.exe\u003c/code\u003e in the same directory.\u003c/li\u003e\n\u003cli\u003eThe system is used as normal, and whenever Adobe Acrobat Reader DC is launched, the malicious \u003ccode\u003eRdrCEF.exe\u003c/code\u003e is executed.\u003c/li\u003e\n\u003cli\u003eThe malicious executable performs its intended actions, such as establishing a reverse shell, injecting code into other processes, or exfiltrating data.\u003c/li\u003e\n\u003cli\u003eThe attacker maintains persistent access to the compromised system.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eA successful attack allows the attacker to maintain persistent access to the compromised system. The attacker can then perform various malicious activities, such as stealing sensitive data, installing additional malware, or using the system as a foothold for lateral movement within the network. The compromise affects any user who launches Adobe Acrobat Reader on the infected machine.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eEnable Sysmon file creation logging (Event ID 11) to detect the creation of \u003ccode\u003eRdrCEF.exe\u003c/code\u003e in the specified Adobe Acrobat Reader directories to enable the rule \u0026ldquo;Deprecated - Adobe Hijack Persistence\u0026rdquo; (Data Source: Sysmon).\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u0026ldquo;Detect Adobe RdrCEF.exe File Creation\u0026rdquo; to your SIEM and tune for your environment.\u003c/li\u003e\n\u003cli\u003eInvestigate any alerts generated by the provided Sigma rule, focusing on identifying the origin and purpose of the created \u003ccode\u003eRdrCEF.exe\u003c/code\u003e file.\u003c/li\u003e\n\u003cli\u003eMonitor for unusual process execution originating from the \u003ccode\u003eRdrCEF.exe\u003c/code\u003e file location.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-03T10:00:00Z","date_published":"2024-01-03T10:00:00Z","id":"/briefs/2024-01-adobe-hijack-persistence/","summary":"Attackers can maintain persistence by replacing the legitimate RdrCEF.exe executable with a malicious one, which is executed every time Adobe Acrobat Reader is launched.","title":"Adobe RdrCEF.exe Hijack for Persistence","url":"https://feed.craftedsignal.io/briefs/2024-01-adobe-hijack-persistence/"}],"language":"en","title":"CraftedSignal Threat Feed — Adobe","version":"https://jsonfeed.org/version/1.1"}