Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbaf9931581560ab…

MALICIOUS

PDF

147.4 KB Created: 2010-03-10 09:53:42 +08:00 Authoring application: PScript5.dll Version 5.2.2 (via Bullzip PDF Printer / www.bullzip.com / Freeware Edition (not registered))
MD5: 2ad8f28185fe87238790b381ca626647 SHA-1: bf2d47e23e9a621e0dd8005bbbc8df3d589732bb SHA-256: dbaf9931581560ab7f5f8d0c17ee8dbf5cd3e105e46c487d990aa87191892e68
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability, specifically targeting the media.newPlayer API. This exploit is designed to download and execute a secondary payload. The presence of multiple embedded PDF objects and obfuscated JavaScript streams further indicates a malicious intent to deliver a multi-stage attack.

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. (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 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/iX/1.0/

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000063a.js
9fddc60761ab49802bc70cde95949a2ed47f759b23ee68a7c16b580217277df1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x63A 2660 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).
legacy_pdfkit_stage_000.js
42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74		 deobfuscated-js string-concatenation normalized Acrobat API aliases at offset 0x63A 126 bytes
objstm_0023_00.bin
e8bfe65c34a535b0837ce7c541e45b42ab61e1ff13de05788daf7770f9a1ec0e		 pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 274 bytes
font_00_sfnt_off0000cf38.bin
b4d29bf8d10c986f2a82be0b40ee30dd295feee8e3c087b5c5fd46a2f8a8db0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF38 230880 bytes
polyglot_child_pdf_off000093e3.pdf
786adb61222a660683903c9bb8a5f26619553108227b120adba3a29341e778b5		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x93E3 113111 bytes
polyglot_child_pdf_off000235cd.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x235CD 6125 bytes

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