Malicious PDF — malware analysis report

Static analysis result for SHA-256 2701437de8ec7274…

MALICIOUS

PDF

67.4 KB Created: 2010-06-29 10:14:47 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)
MD5: cfd84f2b56573f1a89cbd372d0011ed5 SHA-1: a65fb524652b6e7efa61935663bd7641cc526152 SHA-256: 2701437de8ec72746a7dc8d3955a22bc4ab50aebf897cdf06e961d57aff031c6
196 Risk Score

Malware Insights

This PDF exploits CVE-2009-4324 using embedded JavaScript. The JavaScript is obfuscated but appears to load a secondary PDF payload. The primary PDF contains metadata suggesting it was authored by an older version of Adobe Acrobat, which is consistent with known exploit kit delivery methods.

Heuristics 7

  • 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.
  • 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.
  • 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
javascript_obj0021_000.js
dd957791cf3ea91d9aa5ef655b3a1d6c4a92036e875c2437657f276955dab674		 pdf-javascript-stream PDF /JS object 21 at offset 0x514 2371 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s). Carved artifact contains 1 long hex-escaped blob(s).
stream_009_off0000cc74.bin
9d7e19ac218e6f8728365073f89e3d1f12b424f876a74ba4ef022cb2a54a74ce		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCC74 341 bytes
legacy_pdfkit_stage_000.js
42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74		 deobfuscated-js string-concatenation normalized Acrobat API aliases at offset 0x514 126 bytes
polyglot_child_pdf_off0000b506.pdf
b2dbf1b70f29b41da569667ecb933901cca9d7cf6129dc94ac8dfe455737ff8f		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xB506 22634 bytes
polyglot_child_pdf_off0000f583.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xF583 6125 bytes

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