Malicious PDF — malware analysis report

Static analysis result for SHA-256 f993513371f46994…

MALICIOUS

PDF

306.8 KB Created: 2008-05-21 16:10:52 +08:00 Authoring application: Acrobat PDFMaker 6.0 for Word (via Acrobat Distiller 6.0 (Windows))
MD5: 4c18aeaca20eaa9059153c27a75963d2 SHA-1: 728517180d6ed0c9c47f75bbad73837bec12cd89 SHA-256: f993513371f469941bc3bbc7d7bcb54a1541e32104846820f2452aa9b3169381
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_UNESCAPE. A secondary embedded PDF was also found with similar suspicious static findings. The presence of these elements suggests the document is designed to execute malicious code, likely to download and run further payloads. The specific intent of the JavaScript is not fully discernible due to obfuscation, but its presence is a strong indicator of malicious activity.

Heuristics 6

  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • 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.
  • 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/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0031_000.js
aab2d86e5a5b6b544d66e9de934a28fb8c7803d2f7b110b365aa96120546ca15		 pdf-javascript-stream PDF /JS object 31 at offset 0x20B6 2883 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 19 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
polyglot_child_pdf_off0004944c.pdf
008c4852030744ecdb7b72b54a13531912a8e8f4a2ab4269bec37a7551f75832		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x4944C 14030 bytes

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