Malicious PDF / .VIR — malware analysis report

Static analysis result for SHA-256 960f16191cb76e32…

MALICIOUS

PDF / .VIR

14.3 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: e064363f1d971c0cd0ecbf9591af9112 SHA-1: a9381c20336722a459f42585834ef9f22c82727d SHA-256: 960f16191cb76e32717ffe9976cd6049569d2e62e79191ac247111be8aad8158
166 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection identifying it as 'Win.Trojan.Agent-36166'. Additionally, ML classification provided a very high confidence score. The presence of embedded JavaScript, indicated by 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics, suggests the document is designed to execute malicious code upon opening. The extracted artifact 'javascript_obj0007_000.js' likely contains the malicious script.

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
7c7169b3d47961aa9bf9bcab77c1e36be6035e09094b6028951bd9496b9897e8		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74375 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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