Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff183654a3c8a20a…

MALICIOUS

PDF

15.0 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: bf5bd1741847e8b8144072fa185d8709 SHA-1: 316b6e639d2ff1f4bf78b1e9dd1c24e0790b5143 SHA-256: ff183654a3c8a20ab632a79a8bf48bea9a5b6ea8efe68114314e6383c93823ec
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including ML classifiers and ClamAV, identifying it as malicious. The presence of embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS firings, suggests the script is responsible for executing the malicious payload. ClamAV detection of 'Win.Trojan.Agent-36166' further confirms its malicious nature and provides a specific signature for tracking.

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
733acfc90f63aa1ea5d184d8dec2bba9bf151073caefedd348393c1fc4ec101c
pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 84435 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely