Malicious PDF — malware analysis report

Static analysis result for SHA-256 156c39cf6ef71ed9…

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: 3d7e4be5cce99ddcca38b7a0b291bc25 SHA-1: 6e7c0323a4c08526fbfabf73557d3587185e03eb SHA-256: 156c39cf6ef71ed92cbe7be72ed7a784c4d319cca102930cb97ccb52a4ccae24
166 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. Heuristics and ClamAV detection confirm the malicious nature of the file, identifying it as Win.Trojan.Agent-36166. The JavaScript is heavily obfuscated, but its presence strongly suggests it is responsible for downloading and executing a secondary malicious component.

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
41e3d681cc35ed29f894a1489d491bf844333a6799889d2d6d35489a3b892f58		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75092 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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