Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c6a31881ff8494…

MALICIOUS

PDF

40.2 KB Created: 2010-05-04 08:37:44 +08:00 Authoring application: Acrobat Web Capture 7.0
MD5: 6e6a35df564e658e1ed4b73698f96ed4 SHA-1: b490b4a2db3cd55c304909f3ce6a5f6e94254fba SHA-256: 87c6a31881ff8494d481a033d7971dbfecf0b83e05e95a9be1961397dfaff9b3
84 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream, identified as 'javascript_obj0037_000.js', is heavily obfuscated and uses eval() and String.fromCharCode, suggesting it's designed to download and execute a second-stage payload. The presence of these indicators points to a malicious document designed for payload delivery.

Heuristics 6

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • Suspicious extracted artifact medium 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.
  • 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)
  • 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://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0037_000.js
e93f32651195259b64d1a1cedc9097e7cb099d84a8994f3b6627e13d7782b193		 pdf-javascript-stream PDF /JS object 37 at offset 0xA35 16095 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 14 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s). Carved artifact contains 6 long hex-escaped blob(s).

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