Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e02a31e296cb3e…

MALICIOUS

PDF

135.8 KB Created: 2010-03-17 11:16:17 +09:00 Authoring application: WPS Office 个人版 (via PDFlib 7.0.3 (C++/Win32))
MD5: b6d8cda82c3d56007fbeab48c33cbd08 SHA-1: 09c7d8d88143690a6acc5979a0da77921a811418 SHA-256: c4e02a31e296cb3e37629951cfed8ad3c04373e5a2137f7fdb1b92f10338795e
196 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability, specifically targeting the media.newPlayer API. This JavaScript is obfuscated and likely responsible for downloading and executing a secondary payload. The presence of a secondary embedded PDF further suggests a multi-stage attack. The document body itself is heavily corrupted and unreadable, providing no direct clues to the lure.

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. (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)
  • 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 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000063a.js
7f56f093d8771659434745067c97953ac2df3e0aba3bc25530ca783ac303c3e1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x63A 2578 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).
stream_011_off0000eea5.bin
bc74e9ddf10bd5455eb39dcf160780954dd2c6ec712cca0ebc4af1d212406a01		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEEA5 212700 bytes
legacy_pdfkit_stage_000.js
42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74		 deobfuscated-js string-concatenation normalized Acrobat API aliases at offset 0x63A 126 bytes
objstm_0023_00.bin
e8bfe65c34a535b0837ce7c541e45b42ab61e1ff13de05788daf7770f9a1ec0e		 pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 274 bytes
font_01_sfnt_off00018d14.bin
d954d8365e342ffc11be3a98bc3b084c3504deca739f3d423487e01028550c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D14 24520 bytes
font_02_sfnt_off0001b943.bin
b2b40376a3145b09cabf926a3c44fa57d9e5ac7a1418f11ba78ced68b71b0a32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B943 145344 bytes
polyglot_child_pdf_off0000dfd7.pdf
d0beca9695aa7d47ca5f0d332f2b7f6cde3fa5169605537280863ea8e00a1a18		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xDFD7 81737 bytes
polyglot_child_pdf_off00020733.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x20733 6125 bytes

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