Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7c50e2f000baf9…

MALICIOUS

PDF

40.3 KB
MD5: 6cd4f72f8ec70203eaadbab0af715d47 SHA-1: bc85c752ca6d1fe511937c04a4a3c18994f8356d SHA-256: 9a7c50e2f000baf9eef4f19397c333ffddd5831f023a1800c44778b764185236
138 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript and triggers a critical vulnerability (CVE-2009-4324) related to media player actions. The embedded JavaScript, identified as 'legacy_pdfkit_stage_000.js', is obfuscated but appears to be designed to download and execute a secondary payload. ClamAV also detected this file as 'Pdf.Dropper.Agent-7285889-0', further indicating its malicious dropper functionality.

Heuristics 5

  • 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)
  • ClamAV: Pdf.Dropper.Agent-7285889-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7285889-0
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
4ec6f147835999d30fc20fa1b5e276c4ac8556e2672d86241e25f979f3d1b52c		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2461 bytes
legacy_pdfkit_stage_000.js
6ebf8c7a62ce0680c86128c7cf47941f96ddfaae375ad49a1f2484004813a424		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xBB8 2534 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
legacy_pdfkit_stage_001.js
42025b552c7960b53abcd8cd732b01c8d109eccfdfefc352b9826c4d5807d414		 deobfuscated-js cross-stage annotation API aliases at offset 0x1E7 81 bytes

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