Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31206362ebe84dd…

MALICIOUS

PDF

40.0 KB
MD5: f57c8098b6aa455085487c8e9c684cdb SHA-1: 5fd09f2a8fd5e0c179b1f486b90dc6d50b57fc52 SHA-256: c31206362ebe84dd24b639315d613cf47cbcf93a1e86b582ce4ec655aa37932b
228 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

This PDF file is flagged as malicious by multiple engines, including ClamAV which identifies it as Win.Trojan.Agent-36169. It contains embedded JavaScript and exploits the CVE-2009-4324 vulnerability (media.newPlayer). The embedded JavaScript, particularly in legacy_pdfkit_stage_000.js, appears to be responsible for downloading and executing a secondary payload, as indicated by the heuristic firings and the nature of the extracted JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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: Win.Trojan.Agent-36169 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36169
  • 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.
  • 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
3d3627112ea1b9acb876c6ed84eed5eaf2f8aa9be9dbb62767c0c058cd078413		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2019 bytes
Detection
ClamAV: Win.Trojan.Agent-36169
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
6615bafdfca3443f4e226384bdb5b622622cea29fad1cb3aad6a924ef5787e9e		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x9FE 2540 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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