Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca994a0ae32bbb1…

MALICIOUS

PDF

27.7 KB
MD5: bec32ab0cf6984e9c5e3bfcde66d04f9 SHA-1: 0355b021442334e2e126cb935b10a35bf67c60ca SHA-256: 5ca994a0ae32bbb12e1fa41e02e42feb16a8fbd4a24be07d69ff5e15cb3a5f9c
166 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and ML classifiers as malicious, with ClamAV identifying it as Win.Trojan.Agent-36100. Embedded JavaScript streams were found, indicating an attempt to execute code within the PDF viewer. This script likely downloads and executes a second-stage payload, aligning with common exploitation techniques for client 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
5868c7c532b549a079a78ad650560166e7fd9af9f91fac8e68d9b48c714372b3		 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
112f0ba8faa1c9a323e50844d7b4f844977963b756afce245cd9afdd5cdf5ab6		 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
240459b7b20795c953ade6bd4582f68612432a660c4b075c8e11822cbd9f3f00		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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