Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5071906cf29ee6f…

MALICIOUS

PDF

9.9 KB Created: 2010-05-19 08:59:58 +02:00 Authoring application: Jganbo
MD5: c4a06a9e68eba8340aea50fbd71ea0ac SHA-1: 6c0481cd77365c8905526a3ad71a1f67cc3b5dcc SHA-256: a5071906cf29ee6fdf8f065968b3f5730b788042c8e3d077fa881367ef8794b8
66 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream was found to be obfuscated using unescape() and String.fromCharCode(), suggesting malicious intent. The extracted artifact 'javascript_obj0018_000.js' is likely responsible for downloading and executing a second-stage payload. The document body contains seemingly random text, which is common in obfuscated or decoy documents.

Heuristics 6

  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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.
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0018_000.js
c2a54dde13df085137a9e0e810ceb62443e08bdbfc6af303934c48e334af81c5		 pdf-javascript-stream PDF /JS object 18 at offset 0x2351 341 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).

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