Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1911b98f743f8e…

MALICIOUS

PDF

328.6 KB Created: 2010-06-29 10:30:35 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.1.2)
MD5: 4884713fdb285cc211bc36d772f93db9 SHA-1: 944c7f4adac550756011d3fa47a27ebd54aef784 SHA-256: 3b1911b98f743f8efa5647c84df4f8e50c333e4361b4d996a7e82f390319b434
244 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, which is also embedded within the PDF as another PDF file. The polyglot nature of the file and the use of obfuscated JavaScript indicate a downloader or exploit kit stage.

Heuristics 9

  • 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.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • 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 file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (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 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000392.bin
e2acd3c7a70532f2038776f0f47d1fb206b2a9ed57ec964750f5e76141f00a4a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x392 4210 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 3 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 0x392 126 bytes
objstm_0017_00.bin
dd7918c182d6e2b8d996a6b8ee81663c49a0cb297efe1e1fa3c5af0c987bde84		 pdf-objstm-decoded PDF /ObjStm 17 0 obj (inflated) 871 bytes
font_00_sfnt_off0001baeb.bin
058d11642e857508126df5662db2c7af4bdc1892e73eea6fc33f2605a1fc3c20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAEB 94875 bytes
font_01_sfnt_off0002b68e.bin
bc6a95045816f0a477b07500566698436425c6af275534fd7a59ccd6a531abda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2B68E 96476 bytes
font_02_sfnt_off0003b6c4.bin
f88746c3ac401b62be1ebacab3926c499f8361968392428085417cdaebe72618		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3B6C4 101502 bytes
polyglot_child_pdf_off00018aa7.pdf
e9ae3ac954517f01418d11b06f12e84800c6e959aef7bca52a6710263e90617d		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x18AA7 235431 bytes
polyglot_child_pdf_off00050a61.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x50A61 6125 bytes

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