Win.Trojan.Agent-36100 — PDF malware analysis

Static analysis result for SHA-256 04d09bf0923e9238…

MALICIOUS

PDF

27.7 KB
MD5: 58e440a529c8e18f95c0c77b7d7af529 SHA-1: 4fba98954901a3a32aeedf31a76fc9583d503a41 SHA-256: 04d09bf0923e9238c0ea74df875a5cf5b435ad55b2c80cfc6c85946662b72232
166 Risk Score

Malware Insights

Win.Trojan.Agent-36100 · confidence 95%

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded and obfuscated JavaScript, flagged by multiple heuristics as malicious. ClamAV identifies the sample as Win.Trojan.Agent-36100, indicating it's a known trojan. The JavaScript is likely responsible for downloading and executing a second-stage payload, a common tactic for this type of malware.

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
5bc6e434e49241d238f31eaf422c2dc686b3aed4903523b1ef8d2f917bce9672		 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
8b3d39dcbec85a9be37f988894afdb11f297633d595a820b3042815ff419e16c		 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
94d652ef9a607c0298373862e2c765f7dd8f7784c300fbab559c3ed9caab7534		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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