Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c55dee9c497934…

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: 67bdfe3118ee5ca8fef63805cb62c56d SHA-1: 764218d38704c4c54cd9cf982057a5afc3680463 SHA-256: 97c55dee9c497934c854baee23029cebda9c27e6f200c76e4cfb3e14b83178ad
138 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript

The file is a PDF containing embedded JavaScript, as indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detection confirms its malicious nature, identifying it as Win.Trojan.Agent-36166. The JavaScript is likely responsible for downloading and executing a secondary payload, which is a common technique for malware delivery. The document body is heavily obfuscated and does not provide clear textual lures.

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
99611296f602b7a0ff4ee678384f3b373372afc807a8bdfcd47409cc63d7dbbe		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75140 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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