Malicious PDF — malware analysis report

Static analysis result for SHA-256 a573f45fb72bb605…

MALICIOUS

PDF

3.0 KB
MD5: 5dc0459ad4d72fe6b115667a275946b1 SHA-1: 6e7c724c832537f38e3b7ca0d64395eec7e3c754 SHA-256: a573f45fb72bb605c5d487ce2000aee20de15607fdba03817a5dd22400030aa5
418 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript that leverages multiple critical CVE vulnerabilities (CVE_2009_4324, CVE_2009_0927, CVE_2007_5659, CVE_2008_2992) including media.newPlayer, Collab.getIcon, Collab.collectEmailInfo, and util.printf. The JavaScript is obfuscated and uses eval(), indicating it is designed to execute arbitrary code. ClamAV detections (Pdf.Exploit.Agent-16729 and Pdf.Exploit.Agent-35646) further confirm its malicious nature. The primary function appears to be exploiting these vulnerabilities to download and execute a secondary payload.

Heuristics 10

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
  • 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-16729 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-16729
  • 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)
  • 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.
  • Suspicious extracted artifact info 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
62a55e3b6d00cdb555a3f3805646930ecb9b9b9d2b4707578608c6612787f2ea		 pdf-javascript-stream PDF /JS object 7 at offset 0xDB 34894 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
legacy_pdfkit_stage_000.js
3b2f1c1dcdeab7217d3deadd8fe7bc5294088bf0fbd8c3993cc93a64b6b937b1		 deobfuscated-js split-join delimiter stripped JavaScript at offset 0x11A 7534 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35646
Obfuscation or payload: likely
Carved artifact contains 13 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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