Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cee9ecf3b4649ca…

MALICIOUS

PDF

14.5 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: aaa28f6c4c26b0f755ceba6277dfbe80 SHA-1: daca6ea45e9e58b2461557c85bc3ea73e88843a0 SHA-256: 5cee9ecf3b4649cad9398a15bf118caf5fe01db19d08170ca3527be026661c39
166 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, flagged by multiple heuristics and identified by ClamAV as Win.Trojan.Agent-36166. The JavaScript, though obfuscated, appears to be responsible for downloading and executing a secondary payload. This behavior is consistent with a malicious document delivered via spearphishing, aiming to exploit the user's system.

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
bb38528d15c38a37609ea8e80008bf48f8545856cb008e22a4015be32981404c		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74965 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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