Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f3527b43b00ee7…

MALICIOUS

PDF

27.7 KB
MD5: 45adf307734230a520c83574b0f567b3 SHA-1: 5e8d1df1fe7810343f114b6a5600013221fe8e56 SHA-256: f5f3527b43b00ee7bd4c2a2152458a7af57e3cfc3b9f92d8b415954d3305d480
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 the malicious behavior, potentially downloading and executing a second-stage payload. The document body content is heavily obfuscated and does not provide clear user-facing lures.

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
2de7a0c27cb35acca528a990461be5679e0399fb1f6e7efbb00a8408d634bfa4		 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
09e1a95193a01ffca41ba7af4026523ebe80ce7b75bd3f3890f38fa5c819ae83		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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