Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa0974d5ed6c020…

MALICIOUS

PDF

880.4 KB Created: 2010-02-04 22:33:32 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 6.0.1 (Windows))
MD5: b1c4582dad92c742796e3418cd49d2e3 SHA-1: fceab010f172d22fc1b4c031988826d355e9f8b9 SHA-256: dfa0974d5ed6c0201c4bd188d2e4fcbf6b728b5747b0de4c49387cc2ae111b40
158 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The sample is a PDF file containing embedded JavaScript. Heuristics indicate the use of eval() and unescape() functions, common in obfuscated JavaScript payloads. A secondary embedded PDF was also found with similar suspicious findings. The JavaScript is likely used to download and execute a second-stage payload, although the specific URL or payload could not be determined from the provided evidence. The presence of these elements strongly suggests a malicious document designed for exploitation.

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_obj0013_000.js
181704621ed8eb20f91c673eb1a8cf72cce43118740912f68c9b8a16277f7676		 pdf-javascript-stream PDF /JS object 13 at offset 0x3C2 4650 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 15 eval/decoder/string-building token(s).
polyglot_child_pdf_off000da896.pdf
b45356a976c298fba772f539a1b0e65a149a9a53e887709c6e81c3efb262f15d		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xDA896 6447 bytes

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