Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b56d462adf3d13…

MALICIOUS

PDF

45.0 KB
MD5: f0532ebfbc9cb6a96ecc72100dd8e087 SHA-1: 490f97249a5e69f99db84de69cdea1ca9e23bc4c SHA-256: 80b56d462adf3d13e8c6839ebd6f432bfdf58e1983006ba6ab503595192e6182
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 ClamAV as 'Pdf.Exploit.Agent-36128' and contains multiple embedded JavaScript streams. The JavaScript appears to be heavily obfuscated but is designed to execute code, likely to download and run a secondary payload. The ML classifier also strongly indicated maliciousness.

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
2952f91b7049f7659f952de945995953781785848ffd8ed7964060e389e12fa2		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
c8b15cd6a89b0ab1404e56871994e6aac554d1cbcb90c45998536e1c0bd9f7c9		 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
bac2367db62b9c77dcfcc6d724a7712fca092844842de31a4b5db4ac1ff6edc1		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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