Malicious PDF — malware analysis report

Static analysis result for SHA-256 99dae7e44e99cbac…

MALICIOUS

PDF

169.9 KB Created: 2010-06-29 10:14:47 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)
MD5: f107d72ffa5a9f95b77785d060e1e6a5 SHA-1: 360aa19aa6b90141f069935cc807b8ff7fec2c45 SHA-256: 99dae7e44e99cbac66604a317de790e54c1c0fa46048b29e4714e05dfca2fc38
196 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that is obfuscated but appears to leverage the CVE-2009-4324 vulnerability via the media.newPlayer API. This JavaScript is likely responsible for downloading and executing a secondary payload. The presence of a secondary embedded PDF with suspicious findings further supports a multi-stage attack. The benign URLs are likely decoys or standard PDF resources.

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/
    • http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0021_000.js
957de9f4a086ae93ac64207e85a26a8610cb97bc9f41c3b54fc936751c02fdd0		 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
icc_00_off000151e1.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x151E1 3144 bytes
font_00_sfnt_off0001772f.bin
36707e178224cc816eb41f3788e2a8e90ddc26e52d0c3c079d360431813d1433		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1772F 2820 bytes
font_01_sfnt_off00017cfc.bin
8208adcdc2a21ea0163da171ffc38af877094a5bab859ee498d2593fdbecc157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17CFC 195264 bytes
polyglot_child_pdf_off00013312.pdf
e884f8208177f39dfd61d63633cfadab44f49eed0d1ea48874d201448bd4123f		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x13312 95363 bytes
polyglot_child_pdf_off00028fa8.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x28FA8 6125 bytes

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