Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe2df5144370e139…

MALICIOUS

PDF

5.5 KB Created: 9877-77-66 90:10:91 -26:69 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.1.0)
MD5: 43a5dbe42eb015648db86342c4ae25e2 SHA-1: d5469cbd9fa89d1550b8f9db9a6f2a5deb853adc SHA-256: fe2df5144370e139739bb7bc8ff37888372beca2ac506d886fe3900291e178ef
276 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link

This PDF file contains embedded JavaScript that exploits CVE-2008-2992 in Adobe Reader. The JavaScript is heavily obfuscated and uses eval() and String.fromCharCode() to decode and execute a malicious payload. The heuristic firings and ClamAV detection strongly indicate this is a malicious PDF designed to deliver a secondary exploit stage. No specific family could be identified, but the attack pattern is consistent with exploit delivery.

Heuristics 9

  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
  • ClamAV: Pdf.Exploit.Agent-35551 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35551
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • String.fromCharCode medium PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically (matched inside decoded stream)
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0028_000.js
d4b6b405c3e06efc7aaf63d63da91385c84d5937b3445b79488408d0135aa6fe		 pdf-javascript-stream PDF /JS object 28 at offset 0x504 3543 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35551
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
custom_b64_stage_000.js
70147f821d447208a1b33bc67f2fe5c9c2c92620899e76d3eb155dd45c32f20a		 deobfuscated-js custom Base64 decoded JavaScript layer 1 (PDF /JS object 28) at offset 0x86A 1998 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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