Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc2d8ad90af1e8d…

MALICIOUS

PDF

7.7 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)
MD5: fce04347088bedb298796cc610d8295e SHA-1: 4fa5f9364419c962bd43c91572446122ee1b6b4b SHA-256: 9bc2d8ad90af1e8de6e38b2934f7ffab374124151c89882f65b98dbb7291df71
208 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript with multiple eval() calls, indicating obfuscation and dynamic code execution. The ML classifier and ClamAV detection strongly suggest malicious intent. The JavaScript is likely responsible for downloading and executing a second-stage payload from one of the embedded URLs. The specific JavaScript code reconstructs a URL using string concatenation: 'http://phpnet.us/byet300x250.php'.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • ClamAV: Pdf.Exploit.Agent-35587 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35587
  • 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.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://phpnet.us/byet300x250.php
    • http://ad.foxnetworks.com/st?ad_type=pop&ad_size=0x0&section=204717&banned_pop_types=28&pop_times=5&pop_frequency=86400

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0013_001.js
b966a6e6f7bd9ab2be2828cbc3ca8479aa05ac9a4d70a2bb73c463ceb0ba83c7		 pdf-javascript-stream PDF /JS object 13 at offset 0x3D8 5596 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35587
Obfuscation or payload: likely
Carved artifact contains 5 eval/decoder/string-building token(s).

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