Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88d0375e6aea047…

MALICIOUS

PDF

14.4 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 16d2bd2110389168c581b77ed15ccea2 SHA-1: f413b50f77fb992a1a2ab89553c523497dd4e28d SHA-256: e88d0375e6aea0474e313a3413faff92e01b818161370b39155d1e42a2955863
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/Script Execution

The PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection for 'Win.Trojan.Agent-36166'. An embedded JavaScript stream was also identified, indicating the likely execution of malicious code. The ML classifier also provided a high confidence score for maliciousness. The primary attack pattern involves leveraging the embedded JavaScript to deliver the detected trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Win.Trojan.Agent-36166 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36166
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
70209abe5858b873d0fcbadf1cca065b15e9fecb3e85dd48cecab680a641e3ed		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74380 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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