Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a96cf165ac21bac…

MALICIOUS

PDF

45.0 KB
MD5: c0319f46bf6df91c2b5a3fe292533850 SHA-1: bda9a80bfd0d2d5215a4c5877107e72bebc90e47 SHA-256: 5a96cf165ac21bacc8f757222996d80b9602ab5bf241317f378b13f888a6cb25
166 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript streams, flagged by multiple heuristics and ClamAV as malicious (Pdf.Exploit.Agent-36128). The JavaScript appears to be obfuscated but is designed to execute code, likely to download and run a secondary payload. The presence of JavaScript and the ClamAV detection strongly indicate an exploit targeting PDF viewers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-36128 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36128
  • 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
619ffb251d65b175ba543d39d5337b4f973ecfcf4cf08b1e356ab6794c8a2ba3		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
b13a0cf58fddac3cc8c82e249b232e44096743a695309dadf93eec4c3fb6c484		 pdf-javascript-stream PDF /JS object 8 at offset 0x20A 45555 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36128
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
4f8909c1ed1bec00cb83faa2083b6092a3a5125936048fa3bc61fba0b879836d		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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