Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b1da552c51c081…

MALICIOUS

PDF

15.1 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 6c71a2dfd2679387e32f73201a2ed681 SHA-1: bcac1f2c2c7531bba79275e3aae5c0cc6151c369 SHA-256: 70b1da552c51c081b3ff35b7a8a84e160fad2f9f949ee26f3fcb23770b0fa63f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, flagged by multiple heuristics and a machine learning classifier, indicating malicious intent. ClamAV detection confirms this, identifying the sample as 'Win.Trojan.Agent-36166'. The JavaScript is heavily obfuscated but appears to be responsible for downloading and executing a secondary payload, a common technique for malware delivery.

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
f9b0f5750c678c9fe1aca8723c0260be0481ea36bfba7ed718fbf03f1efaf78e		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 83631 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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