Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed823f27f9a13d3b…

MALICIOUS

PDF

93.5 KB Created: 2010-05-26 15:36:36 +08:00 Authoring application: WPS Office 个人版 (via PDFlib 7.0.3 (C++/Win32))
MD5: a15dd93b3bd7ba23fc6476e5665e9d09 SHA-1: 0ab08a4b7a6e70dbae9cc277dd19922b171789e8 SHA-256: ed823f27f9a13d3bc963d4b38f0e5c27892c8693c09e8d2abb186b11469d9954
196 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability, indicated by the 'media.newPlayer' heuristic. The JavaScript is obfuscated but appears to be designed to download and execute a secondary payload. The presence of a secondary embedded PDF also 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000329.js
43df070b8f6670d24486ba843435c40e9384bad77f8d250e75174acc75f20386		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x329 2677 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 0x329 126 bytes
objstm_0024_00.bin
5e33c5e97bbc41469ea4328ae48aa20389a4ed5a4c9608e42a4e56b7bc98859c		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 332 bytes
font_00_sfnt_off0000b241.bin
21ac88f7f13218f1c60435e67fe2bfe7d66bfbdb8152335d9ed765eeb78161cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB241 192092 bytes
polyglot_child_pdf_off0000a1f1.pdf
3a6a44a207f3ded0339b5a3d11a12d5685439c1ae3c4c00c145e0a017b5b7572		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xA1F1 54252 bytes
polyglot_child_pdf_off00015df0.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x15DF0 6125 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.