Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7afc50d9f1a195…

MALICIOUS

PDF

92.8 KB Created: 2010-06-29 10:14:47 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)
MD5: bd2a37436859160dd75dfb97c903206a SHA-1: c80e2848291ec39052adca8bdf359b14a8184688 SHA-256: db7afc50d9f1a195872ff121955b0c995fe6af3ef0ebc7fb19386419e12851f7
198 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 obfuscated and likely downloads a second-stage payload from the external URI http://www.fineprint.cn. The presence of a secondary embedded PDF also suggests a multi-stage attack. The confidence is high due to the critical heuristic firings related to the CVE exploit and the embedded JavaScript.

Heuristics 8

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.fineprint.cn
    • 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
46792053a45d159ff594f2b6f0f4fd5afdb02de252a83fbb1c36c137f58ad9a8		 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_off000078b1.bin
c5a05d2ca966c64fa2d86fe9cfbdcfafeac6ffbc04155f0086fe5d7e173b7501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B1 23872 bytes
font_01_sfnt_off0000b9cc.bin
2f8b1869bde14dfb740c8396a7b517efb19b3b5aface11d70dea7fb82847194e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CC 26076 bytes
font_02_sfnt_off0000fe54.bin
08f370c1d6386ee8aa54fbb27fca0a36c2ce5636f48ec7f358aa63b03f8d15d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 17932 bytes
font_03_sfnt_off00012ccd.bin
1f4747b4e02f482ebae067058f2d9d938427949329c4ead852081e38924180c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCD 9940 bytes
font_04_sfnt_off00014f43.bin
da221eaf9c0703b15f52b4a6970fa71a439df3d18f75c8d84d8a42bde6044dfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F43 3200 bytes
polyglot_child_pdf_off00006112.pdf
55de2de774c2bbe389184955adf9413bb0434d997c8aa876ff7b3960394ebc30		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x6112 70206 bytes
polyglot_child_pdf_off00015b63.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x15B63 6125 bytes

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