Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba79bdf796b57696…

MALICIOUS

PDF

115.2 KB Created: 2010-06-29 10:14:47 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)
MD5: 004e74d54dcf79c641d5cf8a615488a0 SHA-1: 6413fbe0d90cb7f445f76dc8d1ccaacddd55df4a SHA-256: ba79bdf796b57696cc9f9f61ef00bb2c0fd21e2f2188a29a17dff00f9f0fad7f
256 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability through the media.newPlayer API. This JavaScript is obfuscated but appears to be designed to download and execute a secondary payload. The presence of a polyglot child PDF and ClamAV detection further confirms its malicious nature.

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.
  • ClamAV: Pdf.Exploit.Agent-30095 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-30095
  • 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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0021_000.js
28b739cfab167a7f2627f49ca7550b1693eb43cdd3423a5ca9d0f03262dc2006		 pdf-javascript-stream PDF /JS object 21 at offset 0x514 2773 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
stream_006_off00006c31.bin
3886ab59ac239642bb56b1ae2bf6065ed50776f744fca1f2d2ac94fd6a9b5817		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6C31 104520 bytes
legacy_pdfkit_stage_000.js
42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74		 deobfuscated-js string-concatenation normalized Acrobat API aliases at offset 0x514 126 bytes
font_00_sfnt_off00015208.bin
f2f7e21da29e574b97cd7c4e85a900d68932449be732b6d1fcbb49549fece7b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15208 41608 bytes
font_01_sfnt_off000193d8.bin
5edd57eed836fa18756e8bb569c03b5fe73f8d8f843f611b6bb1384fb0a3b583		 pdf-font-stream PDF embedded font (sfnt) at offset 0x193D8 10048 bytes
polyglot_child_pdf_off00006702.pdf
f5d78608bc9eb4bf39102a7752ad6e5d56238698cbb8a7883e1172444f4392ad		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x6702 91577 bytes
polyglot_child_pdf_off0001b4ce.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1B4CE 6125 bytes

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