Win.Trojan.Agent-36166 — PDF malware analysis

Static analysis result for SHA-256 5a881a1358ee9e21…

MALICIOUS

PDF

14.6 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 71cdee86d67270f0e70c7209e81e617e SHA-1: f8a72123686ea4889fc9a964548f1700c09fbe77 SHA-256: 5a881a1358ee9e21c55d6bde1912552d1672fd36ac5729b021585ad478503a2a
166 Risk Score

Malware Insights

Win.Trojan.Agent-36166 · confidence 95%

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

The PDF file was detected as malicious by ClamAV and an ML classifier, specifically identified as Win.Trojan.Agent-36166. Embedded JavaScript was found, which is commonly used to download and execute further malicious content. The presence of JavaScript actions and streams strongly suggests this technique.

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
6b60fa88c141f2f42e6ca221041ed97b30fb8d14faef9ac1fa37bf2714d6758d		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75250 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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