Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8acfe274a876689…

MALICIOUS

PDF

8.1 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)
MD5: e09334d6ff01f5f2fb3d175db65577b8 SHA-1: aa9f4524b3c5a5520d0692964b5eaf7c0ea23bf9 SHA-256: e8acfe274a8766899ee8a68fb23da843d72a256fc7f969f0eb8434295b977ed4
248 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file contains embedded JavaScript that utilizes `eval()` and `unescape()` functions, indicating obfuscation and potential malicious intent. The script attempts to load another JavaScript file from 'http://max.gunggo.com/show_ad.ashx', which is likely a downloader for a second-stage payload. The ML classifier and ClamAV detection strongly support this assessment, flagging it as a known PDF exploit. The embedded URL is reconstructed from concatenated strings within the document body.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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
6f4bf27c3c39f16f24aaf7cebb6fc5174af48b256b4edb2ef6d46f700e53b356		 pdf-javascript-stream PDF /JS object 13 at offset 0x3DD 5750 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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