Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4547262e637b40…

MALICIOUS

PDF

14.3 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 981e89625b1b7a40998b76d100e71c7d SHA-1: f79aea13396553b0e48e7f12475ab76c014cea85 SHA-256: 0d4547262e637b40abfdc712258fee51b236ed5365f1d3d305c0e1f1c2adaab5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, flagged by multiple heuristics and a critical ClamAV detection for Win.Trojan.Agent-36166. The JavaScript appears to be obfuscated but is designed to execute, likely downloading and running a secondary payload. The ML classifier strongly indicates maliciousness, supporting the ClamAV verdict.

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
68b78e326696f71e33ea04fa73364dec3e7de17e3ef98788c5d4fbd16f04a14f		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74738 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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