Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d9cd02799bbb45…

MALICIOUS

PDF

100.7 KB Created: 2010-06-29 10:14:47 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)
MD5: 738af108a6edd46536492b1782589a04 SHA-1: fe9500559d3416c85f4730814e46ef0ada180f20 SHA-256: c1d9cd02799bbb45aa6a37a16f2da1dca86f55e474b0a33e0034232c176b5f99
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 is obfuscated and utilizes the unescape() function. Critical heuristics indicate the exploitation of CVE-2009-4324 via the media.newPlayer API, a known vector for PDF exploits. The presence of a secondary embedded PDF and ClamAV detection as 'Pdf.Dropper.Agent-5357397-0' further confirm its malicious nature. The script's likely intent is to download and execute a second-stage payload, leveraging the identified CVE.

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.Dropper.Agent-5357397-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-5357397-0
  • 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0021_000.js
cb3717cac500cccce254506ced9ba9ba7a87552e28f7874c2ea086fb2af822ad		 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_off000118dc.bin
677273497f979c1e4f9451b20c59cd1e074d4930aa1d3d2c4b31d56e6b401faf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118DC 20336 bytes
font_01_sfnt_off00013e50.bin
cc2f1d900e149e300e3ea8b413e5cc3f7289f978fdc13e4bd09ba5fc773417b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E50 37364 bytes
polyglot_child_pdf_off000066fa.pdf
86b8d30908fb3e45e57569fdb69b514f1bdc583ae08381b8bfd16ed35a03cebd		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x66FA 76738 bytes
polyglot_child_pdf_off00017acf.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x17ACF 6125 bytes

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