Win.Trojan.Agent-36100 — PDF malware analysis

Static analysis result for SHA-256 0593f58248977c5f…

MALICIOUS

PDF

27.7 KB
MD5: 06ab689ae5d9c44fe6aed6f0387acacd SHA-1: 0d6fd804334171104a24bb1ee4767de0a545c92a SHA-256: 0593f58248977c5f65e662d956b7f0cbdd2b58f4be6407ea94c2ba14e2c10651
166 Risk Score

Malware Insights

Win.Trojan.Agent-36100 · confidence 95%

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings and the presence of script streams. The ClamAV detection of 'Win.Trojan.Agent-36100' strongly suggests this is a known malware family. The JavaScript appears to be obfuscated but is likely responsible for downloading and executing a secondary payload, a common tactic for this type of threat.

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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
b56d9951aa8e15db261c31678e48703c17303106567961346156ed279c649477		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 27621 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
javascript_obj0008_001.js
b2249d55ef75931ae9c3c9d740bfbdf4c8d1a046b11ef92666680bf6131832bb		 pdf-javascript-stream PDF /JS object 8 at offset 0x20A 27871 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
0519c2eeee7c41816cbf49d2681de442f624d41ff099e1307f8763d04a3d9708		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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