Malicious PDF — malware analysis report

Static analysis result for SHA-256 825804815d5d5c0d…

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: 1bc54ea0d3e1883865f0732bc9109bfc SHA-1: c7a210f449497984c4f0583c576410554fb09ec3 SHA-256: 825804815d5d5c0d4cf7f6a54672dea45a7f580057bbe8436f7d6fbfd2d665cb
166 Risk Score

Malware Insights

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

The PDF file 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 appears to be obfuscated but is designed to download and execute a secondary payload, indicating a downloader or droppper functionality.

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
c9619d49b3978dbe27d955ea1e19c0cd01077c2f6722381df65068b87c8e6b62		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75005 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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