Malicious PDF — malware analysis report

Static analysis result for SHA-256 2466cc7678ba19c3…

MALICIOUS

PDF

8.0 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)
MD5: b8745b7a41bd0e53fab3c4f5d7435c7f SHA-1: 612804cc2a720b11092223c18e9420316676abe4 SHA-256: 2466cc7678ba19c370f68397210f12dead7ddbd1e1ebf8ddd8303146d62b8091
218 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript with multiple obfuscation techniques, including eval() and unescape() calls, as indicated by the PDF_EVAL and PDF_UNESCAPE heuristics. The script reconstructs a URL to 'http://max.gunggo.com/show_ad.ashx?type=pop&sid=2373&cid=2590&cm=1&fc=4&hr=24&cb=' which is likely used to download and execute a second-stage payload. ClamAV detection further confirms its malicious nature. The presence of JavaScript actions and embedded JS streams points to a common PDF exploit delivery method.

Heuristics 8

  • 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
  • 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.
  • 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://ads.doclix.com/adserver/serve/js/doclix_synd_overlay.js
    • http://max.gunggo.com/show_ad.ashx?type=pop&sid=2373&cid=2590&cm=1&fc=4&hr=24&cb=

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0013_001.js
782ee8c4d3123020f922e58e124241c7292f24f5d76840fdfb9b681eef165152		 pdf-javascript-stream PDF /JS object 13 at offset 0x3D6 5704 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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