Malicious PDF — malware analysis report

Static analysis result for SHA-256 2592a06fe1a9c374…

MALICIOUS

PDF

85.3 KB Created: 2010-05-12 09:23:12 +08:00 Authoring application: WPS Office 2009 专业版 (via PDFlib 7.0.3 (C++/Win32))
MD5: 4c84c0f84cd38ad6c72016c45bb39366 SHA-1: 50e172920d51eb9dfb418fcb6ca2437c92708dc1 SHA-256: 2592a06fe1a9c3746bbdb4f5d86f69b7bf6990def70cebd0af657c0ac555b4f8
196 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits CVE-2009-4324 using the media.newPlayer sink. This JavaScript is designed to download and execute a secondary payload, as indicated by the 'unescape()' call and the 'EXTRACTED_FILE_STATIC_TRIAGE' heuristic. The presence of a secondary embedded PDF further suggests a multi-stage attack. The exact nature of the secondary payload could not be determined due to obfuscation, but the exploit chain is clear.

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
447cccb0b28690cfd35e6c7d285b83d1ca96a54fd0f2a437498ab8c6a303cc5d		 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_off0000a641.bin
6dd60b9e04ac51bf24d4de210fbc72ff132aaeaf8b3250ba60cfc0e7875b2eaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA641 182864 bytes
font_01_sfnt_off0000faab.bin
602e48f93b110694627853083e7681181020bd5e908e4a513e77f1b02be317b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAB 20796 bytes
polyglot_child_pdf_off00009fd3.pdf
e8b0963195e76be4595e3e3087623b1d618113cfb0c2fd167be45f4b8e6fab12		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x9FD3 46432 bytes
polyglot_child_pdf_off00013d46.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x13D46 6125 bytes

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