Malicious PDF — malware analysis report

Static analysis result for SHA-256 6540f4a61c00f80d…

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: 626a53489eb70ac43a37592c92db5639 SHA-1: 01d8ba5442779d4f91df670dea5c30c42b628bf5 SHA-256: 6540f4a61c00f80d8c344c3e8810b3ed3f9629f1e1d07d68159a2162795faa63
166 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, which identified it as Win.Trojan.Agent-36166. Embedded JavaScript, identified as a PDF action and JS stream, is present and likely responsible for downloading and executing a second-stage payload. The presence of JavaScript and the ClamAV detection strongly suggest a malicious intent, likely delivered via spearphishing.

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
ce6bbe202e258a1206d8ca99f17bacb9703ebbed413117befc8607d61303d52e		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75178 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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