Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c60b88f0f3b20a…

MALICIOUS

PDF

14.6 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: ce890817337498624bd5ba31bab0d485 SHA-1: 8ffc82732170b76a79089a48e2d20dee5f8a1308 SHA-256: 21c60b88f0f3b20a564d840a3a0ea5789c1c5e493a3825982a87e9f1c16e3ef3
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV with the signature Win.Trojan.Agent-36166. Static analysis revealed embedded JavaScript, indicating an attempt to deliver a malicious payload. The JavaScript action and embedded JS stream heuristics confirm the presence of executable code within the PDF. The primary intent appears to be the execution of a second-stage payload, likely a trojan agent, as suggested by the ClamAV detection.

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
3fe8c35a16dce43b5f80062947326d1a4c8f444b19b102b93b7d34ec799613a9		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 76091 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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