Malicious PDF — malware analysis report

Static analysis result for SHA-256 df10eaecb610f618…

MALICIOUS

PDF

137.2 KB Created: 2010-04-26 21:31:54 +08:00 Authoring application: Writer (via OpenOffice.org 2.2)
MD5: 8a00f6c06a91dbaba6b91255f544de87 SHA-1: abee06e8bbed21a2fc08357b998296c006b3af6b SHA-256: df10eaecb610f618e146f38c13421208179316b6e4a896c4d4177c6b3e7e1f1c
198 Risk Score

Malware Insights

The PDF file contains embedded JavaScript that is obfuscated using unescape() and exploits CVE-2009-4324 via the media.newPlayer API. This indicates an attempt to download and execute a secondary payload. The presence of a secondary embedded PDF with suspicious static findings further supports a multi-stage attack. No specific family could be identified.

Heuristics 8

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
  • 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)
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000006c2.js
16fd1853a051e1526e1ee8e6ae801f5577209d65b890e8242618045845deb97e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6C2 2610 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
legacy_pdfkit_stage_000.js
42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74		 deobfuscated-js string-concatenation normalized Acrobat API aliases at offset 0x6C2 126 bytes
objstm_0023_00.bin
e8bfe65c34a535b0837ce7c541e45b42ab61e1ff13de05788daf7770f9a1ec0e		 pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 274 bytes
polyglot_child_pdf_off0000afeb.pdf
ce3f538c3f09d8ebbf4f19eb2b74b3ca8fedcfd206ea13a207eb8d99c92e2d84		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xAFEB 95431 bytes
polyglot_child_pdf_off0002090d.pdf
71d32ab47b67f12ce5d49e13be7d6e64f19fc8ef5cc4d2990b79710fd9977074		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x2090D 7077 bytes

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