Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd60a8648da5cb7a…

MALICIOUS

PDF

27.7 KB
MD5: 759db281de3e962961cd7a89794cfc36 SHA-1: 86c231e4e53afabe3dc2be36261c7c2277b38690 SHA-256: bd60a8648da5cb7a0cf94486806f513ef47d3ed38d82eb37c42948aba81dc739
136 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings. ClamAV detections confirm the file is malicious, specifically identifying it as 'Win.Trojan.Agent-36100'. The embedded JavaScript is likely responsible for exploiting vulnerabilities within the PDF reader or downloading a secondary payload. The document body content is heavily obfuscated and does not provide clear user-facing text.

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
309013581689d2a98f818dbe0a3d54c693d1f3e7047e71b38ea99437d4e920c6		 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
aaa63b5584ca3f478a19a731f8b0654bedf9de877ab606d0c53b046fa711dd1b		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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