Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a48abbe8b3188a…

MALICIOUS

PDF

27.7 KB
MD5: 7d55519d8c0dc01072abed71ad2aae49 SHA-1: 58ca48651266e32e4ee5ca5a38f324f914e9b251 SHA-256: b9a48abbe8b3188a630e6a935a8984526e28d3164a7fba468cde2b22dfbab208
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 its malicious nature. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, which is a common technique for malware delivery. The DOC BODY content appears to be obfuscated or malformed, 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
28f8f3685f39035f6e04a6906cc62fada40632c96d048f53858434379aee8719		 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
22e117e74c04a13fafa751d3ed49f30eb78c6ec5e30bb9846065c80ed9fdd69e		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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