Malicious PDF / .PHP — malware analysis report

Static analysis result for SHA-256 0f026ee4cd204120…

MALICIOUS

PDF / .PHP

15.1 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: aad81002715a778b2fd77d4d4fa51502 SHA-1: 3280013d8911bf972da16de1c0b951c61f04ffc9 SHA-256: 0f026ee4cd2041205a03ff6cbf1bac84b42545fd3c6f5cd7d4f247b25b2479cf
166 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as Win.Trojan.Agent-36166. It contains embedded JavaScript which is designed to download and execute a secondary payload, indicated by the obfuscated string concatenation and the nature of the script. The presence of JavaScript actions and embedded JS streams points to an attempt to exploit the PDF viewer.

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
f8f278a2c99c87711eee02742bf5c984bd626814578252071fa699e78672f5c3		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 84687 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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