Win.Trojan.Agent-36100 — PDF malware analysis

Static analysis result for SHA-256 ebb77e9ca118c66a…

MALICIOUS

PDF

27.7 KB
MD5: e43214a879f987f8c3d7eac8b6998b1d SHA-1: 7bb2b41514299269348d0cb008a62f10f4bffd69 SHA-256: ebb77e9ca118c66a27a42bab05657c4235cd0a6e853d5d6f5e3e37cd729684aa
166 Risk Score

Malware Insights

Win.Trojan.Agent-36100 · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged as malicious by multiple engines, including ClamAV which identified it as Win.Trojan.Agent-36100. Heuristics indicate the presence of embedded JavaScript, which is likely responsible for executing the malicious payload. The ML classifier also returned a high probability of maliciousness. No specific URLs or further script details were extracted to detail the exact payload delivery or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
a6706190c2e839121e94409a2c515e282eb18d93ad9a6993577cf57df322e44d		 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
39bee8e8e919b43e2d0bf6ab56926daf1b2fdb74ad1c975f491a9af8f21019d2		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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