Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b3f9c616b1e844…

MALICIOUS

PDF

45.0 KB
MD5: e703fa3e5ccd1c03ce96889421674e10 SHA-1: 3c1753f2211c2b6f8072276a76e6d6f2c7d46b2f SHA-256: 88b3f9c616b1e844a1108d6ac2fda400832fb960a954bef912a9f327026d4a11
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, 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 ML classifier also strongly indicates 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
0e1dd6299b0f76c7bf7a90daa0a4b83f25c6f3447e2411fc20a40e91de884fb8		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
d4109b936e3d3343567ac15d5e1cb1cc70fc7e228feaab43ed87e4d72b2e4d1b		 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
7de64d0aa4f6a8f6aae4608049c3807aeb2f7a888b6c110fc7c13eec0b840911		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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