Malicious PDF — malware analysis report

Static analysis result for SHA-256 592f76c3c37821bf…

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: 5a8ad1e599296dab7ff7a8d6395e4793 SHA-1: d87f58ec8a9630e51a57e06c77439db27538651b SHA-256: 592f76c3c37821bf2a5c26fde55118eb186aba81173a5651fafd7466b169bc79
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 execute arbitrary code. The presence of JavaScript actions and embedded JS streams strongly suggests the document is designed to exploit vulnerabilities or deliver a payload. The document body is unreadable, but the technical indicators point to a malicious script execution.

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
88575c222f44b91d3d97301476a825f143c68d34065d7858d6b4e778e3d601bd		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74561 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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