Win.Trojan.Agent-36100 — PDF malware analysis

Static analysis result for SHA-256 5c935b3e1c84c6ad…

MALICIOUS

PDF

27.7 KB
MD5: 86e1d138debbb8d8bad95f80dc89f8fa SHA-1: 8fd33dcf43d906bfad0cb117fa08038eaa8ea0cf SHA-256: 5c935b3e1c84c6ada94a539078cdb75c5ce0257113dfa76533314e9329af7447
166 Risk Score

Malware Insights

Win.Trojan.Agent-36100 · confidence 95%

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Win.Trojan.Agent-36100. Embedded JavaScript streams were detected, indicating the likely execution of malicious code. The script's obfuscated nature and the presence of PDF-specific JavaScript actions suggest it is designed to download and execute a secondary payload, aligning with the behavior of a trojan agent.

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
9e7cb0b842c1f5e189d1fe4b20049f231a7dedcb6d87714a6519e6527d9d71dc		 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
4b6de372052f5606fa4ed3e69af2f08029b3f38b45d92fb7d1b237e2d81cf0e4		 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
ec00746178bb8556c8ff5bb4a496c3b71330d88beb2db74cd309e92103ae9da1		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.