Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efdcaf1376a6f59…

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: d4908380c36e0d0602d5ace73c93bedc SHA-1: 7ab0cc95d6ce828ce0846d7aa7785bbd10ca48bf SHA-256: 7efdcaf1376a6f5941c188d47bab0964f65bb7eabcff2e71bbbd4c133f784d43
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was detected as malicious by ClamAV with the signature Win.Trojan.Agent-36166. Static analysis revealed embedded JavaScript, indicating the document's purpose is to execute malicious code. The JavaScript action and embedded JS stream heuristics suggest the script is designed to download and execute a second-stage payload. The exact nature of the payload or its download source could not be determined due to the obfuscation or truncation of the script.

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
69a7f663451b2ff56bd9f00894a281f3aeedbc76576d604ad84e2d88b2b2811c		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74689 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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