Malicious PDF — malware analysis report

Static analysis result for SHA-256 331081fefda85875…

MALICIOUS

PDF

27.7 KB
MD5: 8a5427b551474a27816e893e9a60c86b SHA-1: 773e0d1ed1d88ac6b62b1891dd3c38087294cc4e SHA-256: 331081fefda85875ad6551e3b3be82fbf72359962aa8ee7d06aa024ebc629384
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detections (Win.Trojan.Agent-36100) confirm the malicious nature of the file. The JavaScript is likely responsible for downloading and executing a second-stage payload, although the exact functionality is obscured by obfuscation. The DOC BODY content appears to be malformed or encoded, providing no clear user-facing lure.

Heuristics 4

  • ClamAV: Win.Trojan.Agent-36100 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36100
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
c62f8dd3304ff3c0ce6b8e8b03507582afe9ec6def132487b0205434ac7b2be1		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 27621 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
1f4555596a05e8db82f047313738d3d6912994a8c79fc216687418f1c923cb99		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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