Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d3f0c47b83ce1d…

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: 279cb7a2e5e60cabb4bb232c8b95e1c3 SHA-1: fe472bcc30b3e45647cd07fc9d4fa64499c96a0c SHA-256: c2d3f0c47b83ce1d3a9a50a3a65028adaa6ea2e8603199c36ce21f7d4a177d37
138 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 an attempt to execute malicious code. The presence of JavaScript actions and embedded JS streams strongly suggests the file is designed to exploit vulnerabilities or deliver a secondary payload. The differential parser failure also points to potential obfuscation or structural anomalies common in malicious documents.

Heuristics 5

  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
eeee1e546ace5f3c8e1b27486636d843ae970ec794e301a0b631c6d5f9d16e86		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74241 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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