Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff0e3ede9135de1…

MALICIOUS

PDF

45.0 KB
MD5: fdba212b997b7c55fb8c2cc80de37592 SHA-1: 8443d38232897d102c0b52d1b8fd2afa74bbfe00 SHA-256: 4ff0e3ede9135de13cb677a6f273a842c44cdd192a208916fdcadb9259edb989
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

This PDF was flagged as malicious by multiple engines, including a critical ClamAV detection for 'Pdf.Exploit.Agent-36128'. The presence of embedded JavaScript streams and a deobfuscated JS file indicates an attempt to execute malicious code. The ML classifier also strongly indicated maliciousness. The exact payload and execution chain are not fully discernible from the provided evidence, but the techniques suggest exploitation and payload delivery.

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
747928072cb2fd63721a1972636562a8c0c0331029195315748c106cdfbca826		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
a32384064c176b2c0098fb64d89ab6edfacb5586da7bdf10951c50e603439bfb		 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
58cc907a80d449597d19a5f01d1bde6b30d2f6d7d15c1f7eae2aa099dd84c28a		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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