Malicious PDF — malware analysis report

Static analysis result for SHA-256 40533863fdf51bb2…

MALICIOUS

PDF

27.7 KB
MD5: d44f1b03fb13045b5373c14f89aaa6e6 SHA-1: 02272a87dfd6183c569db43f7e977e63313d66bc SHA-256: 40533863fdf51bb26e70e7f557effa7b6bcca773d05424083d291a289fe8e8a3
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, as suggested by the presence of large JS files. The document 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
9dd4579ad2981131dc11d07ce496b4c78cbd41444bc02aafe44d00f43c7105ab		 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
47b1150a9c30663ef96208df35d12baa8310f09c55cc32aff861da91f1987dc1		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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