Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22fb992ee5bdead…

MALICIOUS

PDF

27.7 KB
MD5: 723671b9a8ca5485d6a81008f2d05a98 SHA-1: 9609d9c91caebce6bc5e30f11ca8781a9814719b SHA-256: a22fb992ee5bdead15f15b804b1fe6acff4aa4049caee9428e9524026c506908
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detections confirm the file is malicious, specifically identifying it as Win.Trojan.Agent-36100. The embedded JavaScript is likely responsible for executing malicious code or downloading further payloads, aligning with common PDF-based attack vectors.

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
e0925ef8cbf1984c531928eb7b4937f09dd4fe57428f6bb82e5b1e04b740cb92		 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
6c1cbecf24c91b0d176693d7e11bfef5684f11f2ca3f46c013dc72b27c9b971f		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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