Malicious PDF — malware analysis report

Static analysis result for SHA-256 08137f27a88fdcac…

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: 5a1b437f95c0b0da77ed4de920553db4 SHA-1: 03fedd86a51d9f1e27c63fd484e8658d0d6f4812 SHA-256: 08137f27a88fdcac6d3a893d2abb892a33305e4c62e9f6fa8b18f2562270c974
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by ML classifiers and ClamAV, which identified it as Win.Trojan.Agent-36166. Embedded JavaScript, detected via heuristics, is likely responsible for downloading and executing a secondary payload. The presence of JavaScript actions and embedded JS streams strongly suggests this malicious behavior.

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
f388703fb0fce81f1af934b4bd42fe82e7ab802e291e6d31a4ca2d8d83f32a86		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74805 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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