Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5e0281ecb6d25d…

MALICIOUS

PDF

163.8 KB Created: 2010-06-29 10:14:47 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)
MD5: db03f81c99316837d5620974a8373013 SHA-1: 304d0874f499290c392bf6cf7de53cea72837a5a SHA-256: 3e5e0281ecb6d25d16c4a78d8bfe19b59329b608baa620877d4d4fe34ba2c09a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1204 User Execution

This PDF file contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability (media.newPlayer) to execute code. The JavaScript is obfuscated but appears to be designed to download and execute a secondary payload. The presence of a polyglot child PDF further suggests a multi-stage attack. The primary IOC is the suspicious URL found within the document.

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.a-pdf.com\
    • 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 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0021_000.js
f9c847a7c0ff6ec6130339bfb6ac925c2c8f6080d3a3bdaaf2539953ae6ff1c4		 pdf-javascript-stream PDF /JS object 21 at offset 0x514 2284 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).
legacy_pdfkit_stage_000.js
42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74		 deobfuscated-js string-concatenation normalized Acrobat API aliases at offset 0x514 126 bytes
font_00_sfnt_off00018919.bin
b1eb36a515d980f80d5c54a197e8c789e446673f747636ed8b6c9684d58d9b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18919 20936 bytes
font_01_sfnt_off0001bbaa.bin
64a159c4cd3b20c3f717653bc583d2e27efa76e8e3965969f70e19f327030ff5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBAA 33344 bytes
font_02_sfnt_off000200ee.bin
8264cd10bdad8f91ba5efcb90f2d2a8a983e19f0689264b3f6cf23ce80a8f198		 pdf-font-stream PDF embedded font (sfnt) at offset 0x200EE 18052 bytes
font_03_sfnt_off00022920.bin
14a9fe941e1a874404667226c12fdf36c6ff035e30f05a47f1454cd052129aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22920 14272 bytes
font_04_sfnt_off000245b1.bin
0777916c16e7984e70f5cf9ad032a20df7fde0810ba245a99e59d50a9f09b3b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x245B1 21920 bytes
polyglot_child_pdf_off0000ef06.pdf
670add93e7c699e06699776a8d7d9069bfe44577ee4bd10d20ce6f99d3222cae		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xEF06 106518 bytes
polyglot_child_pdf_off0002772f.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x2772F 6125 bytes

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