Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5431e7dbbafed57…

MALICIOUS

PDF

177.1 KB Created: 2010-06-29 10:14:47 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)
MD5: 5947f4d836f475b6d571439813ca5509 SHA-1: adcc7efa26cdad8e05d2f5dd4b94544d64cee0ce SHA-256: c5431e7dbbafed57f80f5ff2d46880278ce43d4c46cc6de416af680ed866f2ee
196 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript that exploits CVE-2009-4324. This exploit is used to download and execute a secondary payload, indicated by the 'media.newPlayer' heuristic and the deobfuscated JavaScript stream. The polyglot nature of the PDF and the presence of multiple embedded objects suggest a complex delivery mechanism.

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.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
763702855f717aa9b10bd28af70f5684a1d0a29a045550a12e1f6e39e522f573		 pdf-javascript-stream PDF /JS object 21 at offset 0x514 2371 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_off000080d5.bin
9161fe4440afa1ae3e8407dce1abb8b94f46f8ce58e6f9bf1d8f9891823f43f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D5 60696 bytes
font_01_sfnt_off00010131.bin
f6b53fda44c6463c5a0344b3ef90f0916928cfce19069bec8cf49c790afed189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10131 72556 bytes
font_02_sfnt_off000194cf.bin
f5ef29e4332f3cd319a38c8a52e634c761a739ab4f0338becd4ce85a08297ecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x194CF 62588 bytes
font_03_sfnt_off00021b56.bin
f36a023a5517222496e5870cea7f326d83e90b31d140d9b5cbf72d52f6d7d677		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21B56 40868 bytes
font_04_sfnt_off00026545.bin
e9897606f4db24a3e9dc1d502853f12f9610c416fa81efd627e27308caf83238		 pdf-font-stream PDF embedded font (sfnt) at offset 0x26545 42140 bytes
polyglot_child_pdf_off000064fe.pdf
c9eb1336cf1a894cdb42b01592e8c8cdddad4d8c8a0f47173e3747c58c2ab8e7		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x64FE 155472 bytes
polyglot_child_pdf_off0002ac61.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x2AC61 6125 bytes

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