Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18aec4840b65140…

MALICIOUS

PDF

368.5 KB Created: 2010-03-30 17:05:37 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 6.0.1 (Windows))
MD5: 297824c53eb07273284e97bbe5593d8e SHA-1: 927878a43a805de28eae39eb7c0f80705025bde0 SHA-256: d18aec4840b651403fc1c3153325d83311d9d81b859efec49702ab1c9882bfaf
158 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, including calls to eval() and unescape(), which are commonly used for obfuscation and executing malicious code. A secondary embedded PDF was also detected with similar suspicious findings. The primary function of the embedded JavaScript appears to be the exploitation of PDF vulnerabilities to download and execute further malicious content, indicated by the 'POLYGLOT_CHILD_PDF_STATIC_TRIAGE' heuristic firing with a high score. No specific malware family could be confidently identified.

Heuristics 7

  • 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.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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/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_obj0014_000.js
f88a00e927e26df17805ed162ce7be240b356db723ca38aa13d59e510c6f437e		 pdf-javascript-stream PDF /JS object 14 at offset 0x2CC 4691 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 16 eval/decoder/string-building token(s).
polyglot_child_pdf_off0005a9de.pdf
5d1a7bab96c6cdecbfa015528b426866f21073a9a631dc8106479c86fd3208cf		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x5A9DE 6177 bytes

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