Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b4f77bcffab8cd…

MALICIOUS

PDF

7.8 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)
MD5: a0ad2b5e2c1a9ed5cbb90f954774f394 SHA-1: 43e7cb3ffb7099391ad1686bf7cf7147bde5adba SHA-256: f2b4f77bcffab8cd5ae20dcac9b78a6073c4aa659837e4a470a40c508f5a710f
98 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript that utilizes `eval()` and `unescape()` functions, indicating obfuscation. The script attempts to dynamically construct and execute a script tag pointing to 'http://max.gunggo.com/show_ad.ashx?type=pop&sid=2373&cid=2590&cm=1&fc=4&hr=24&cb=', which likely serves as a downloader for further malicious content. The presence of JavaScript actions and streams within the PDF, combined with the obfuscated script, strongly suggests a malicious intent to compromise the user's system.

Heuristics 6

  • 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
1320bad993491e6f2964722d3c76b672bb03020e143875931d0cc43dd52eb419		 pdf-javascript-stream PDF /JS object 13 at offset 0x3D6 5477 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 5 eval/decoder/string-building token(s).

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