Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2bcfb581ff298d…

MALICIOUS

PDF

15.0 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 1c8a0ff53c929e778d1a78ac3ee06137 SHA-1: 21edb06dc93191046d68645b62705bbc844a5281 SHA-256: 7f2bcfb581ff298d45a887670db193b9910c336ebe33ebff9627e80944d6b66c
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 a potential for malicious code execution. The presence of JavaScript actions and embedded JS streams strongly suggests the file is designed to download and execute a second-stage payload. The exact nature of the payload or its ultimate destination 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
9a38fb9907c49923612b502ed044082e86c091c526638bbd72633373c6cbb811		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 84128 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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