Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cd831bbc2b95a3…

MALICIOUS

PDF

36.0 KB Created: 2009-05-01 21:21:45 Authoring application: tvEeSFCPx (via NeTSnrx)
MD5: a76ab4dd31211c6998af165ba527ac43 SHA-1: df646d5816f91e5e238c0e4d05adf96edfaf6dfc SHA-256: f1cd831bbc2b95a33214b801a4a2f30bc1e18ba5d8f56a7cf8b01a8c3740991a
188 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript streams, with high-severity heuristics indicating the use of eval() and unescape() for obfuscation. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically a dropper agent. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, although the exact mechanism is obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-7322861-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7322861-0
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
81fc6c032d9d89de055028250e64369626166f6da69eb623a223ab77c9d1d342		 pdf-javascript-stream PDF /JS object 7 at offset 0x215 35626 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
javascript_obj0007_001.js
1b4403b29b706b70845fde08d12486dc846761f8706f84aea2c263ba2439909d		 pdf-javascript-stream PDF /JS object 7 at offset 0x215 35539 bytes

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