Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9e6a29cadab60a…

MALICIOUS

PDF

8.2 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)
MD5: 8c199bf9c6f39077299c511aa730d4f8 SHA-1: dcee3a6cfbb5a49bc99c3370249110e85bb01c65 SHA-256: fa9e6a29cadab60a211295e5066152103b6c51505aba090321685f677d325daf
218 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript with multiple layers of obfuscation, including the use of eval() and unescape() functions. The script attempts to reconstruct a URL by concatenating strings: 'http://max.gunggo.com/show_ad.ashx?type=pop&sid=2373&cid=2590&cm=1&fc=4&hr=24&cb=' followed by a cache buster. This indicates the script's purpose is to download and execute additional malicious content from a remote server. The ClamAV detection of 'Pdf.Exploit.Agent-35587' further confirms its malicious nature.

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
455d4054f2b6652bbb0095bcddb2fa00eb87c4318e64d2e5192c98ccc4855b96		 pdf-javascript-stream PDF /JS object 13 at offset 0x3DA 5856 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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