Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7e1eb22e4b568f…

MALICIOUS

PDF

27.7 KB
MD5: 00b4b686350c2a02ae4d88d14b7735e0 SHA-1: 42d0f0162e6292dfa14d293b42731b25fb6076f3 SHA-256: fd7e1eb22e4b568f699c38ddbe39f0eb2de4b250da53d1931ca0fdfdf62afe12
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 second-stage payload, although the specific actions are not fully detailed due to 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
0edb6d00cb15fd670632207a7bf689ae75093ca75ff343ea7d8e75b72efe6d79		 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
2953f757a5f506b01c83ec8a3b3266a39b8065716774dc0171f7389afdb9ac74		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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