Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfb48b997751a3f…

MALICIOUS

PDF

14.4 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 9394696d870edd93a4b6724adc11cd16 SHA-1: 08fcecfc1a7a256323d52131871d8bd59dd1eb52 SHA-256: fcfb48b997751a3f55ca30b1f9e022c43df05e66730c677dc3bfd52d66681f49
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The file is a PDF containing embedded JavaScript, as indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detections (Win.Trojan.Agent-36166) confirm its malicious nature. The embedded JavaScript is the primary mechanism for delivering the malicious payload, likely involving downloading and executing a second-stage artifact. The specific JavaScript content was too large to fully analyze but the presence of these indicators strongly suggests a downloader or dropper functionality.

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
a31d0d3f63184108970fa842459a934da4b7c25b92e6a5947852d981e5b2a34d		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74620 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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