Malicious PDF — malware analysis report

Static analysis result for SHA-256 78984100369d72f0…

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: e1308903b7b0f9c249352513532aa4e3 SHA-1: 6969c2acbde5bf8e7c97430039a7c9e4b56d7f6f SHA-256: 78984100369d72f0394c71e766e18de6c47c65cb23eb733a6e7fda36f0522ccb
166 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, flagged by multiple heuristics and a machine learning classifier as malicious. ClamAV also detected it as 'Win.Trojan.Agent-36166'. The JavaScript appears to be obfuscated but is designed to download and execute a secondary payload, indicating a typical dropper or downloader functionality. The presence of JavaScript within a PDF strongly suggests exploitation for client execution, 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
9f48db38c20e130b919af2ffd074451f9882b49c4fc559c6b6510ec7a68e91fb		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74977 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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