Malicious PDF — malware analysis report

Static analysis result for SHA-256 2532c39a9227d272…

MALICIOUS

PDF

126.7 KB Created: 2010-04-26 21:31:54 +08:00 Authoring application: Writer (via OpenOffice.org 2.2)
MD5: 536c0afe4d655a66dccad4af9679caa9 SHA-1: 085bd31e2633f748b5b541da26978c35bf127462 SHA-256: 2532c39a9227d272050ab3545c18bab989ed3dbf0e7826fa1ac4c06dcb696383
196 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits CVE-2009-4324, specifically targeting the media.newPlayer API. The JavaScript is obfuscated but appears to be designed to download and execute a secondary payload. The presence of a secondary embedded PDF further suggests a multi-stage attack. No specific family could be identified.

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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000063a.js
16fd1853a051e1526e1ee8e6ae801f5577209d65b890e8242618045845deb97e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x63A 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 0x63A 126 bytes
objstm_0023_00.bin
e8bfe65c34a535b0837ce7c541e45b42ab61e1ff13de05788daf7770f9a1ec0e		 pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 274 bytes
font_00_sfnt_off0000d5f8.bin
b5cff015dcc6c3e261943486abd3dd9cac9da5d60cf960b1d180b4d468989919		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 37928 bytes
font_01_sfnt_off0001308f.bin
a229df70a2385bf777c633002d6f98d098d351eab2e47f81060d759fcfc3eaeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1308F 81732 bytes
polyglot_child_pdf_off0000a1d7.pdf
19c8b442ae6fc10b4aabce248be69d3f49ce38ad8b33f0b5061dd767cafebc40		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xA1D7 88291 bytes
polyglot_child_pdf_off0001e2cd.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1E2CD 6125 bytes

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