Malicious PDF — malware analysis report

Static analysis result for SHA-256 8649bb81706ca80e…

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: 274ca600adc222494d22a354a500d9a0 SHA-1: 727dd26c9bbd7d162b9948b2b827d11461a1ee07 SHA-256: 8649bb81706ca80e1888594867215f2d171ddcbab1e0e82e46ae1f56e20a8244
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript 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 downloader or agent trojan. The presence of JavaScript in a PDF strongly suggests it was delivered as a spearphishing attachment.

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
ce323a979da55b360505cf3fc4cb727e66c68fed1e4c1bd8e18ade44f212ce75		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75155 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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