Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4deed862ab102e…

MALICIOUS

PDF

264.6 KB Created: 2010-06-29 10:30:35 +08:00 Authoring application: Writer (via OpenOffice.org 2.2)
MD5: 949265ee1d3e587152a23311a85b3be9 SHA-1: dbe83ac7ca51128f77e39f426dceadc73dba3f01 SHA-256: cd4deed862ab102e7fbccc85ee87b09fbb3e6374b51b99f97c904abd4b590f01
304 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

This PDF file contains embedded JavaScript that exploits CVE-2009-4324, specifically targeting the media.newPlayer API. The exploit is designed to download and execute a secondary payload, as indicated by the 'Pdf.Dropper.Agent-5303061-0' ClamAV detection and the presence of an embedded, suspicious secondary PDF. The obfuscated JavaScript and the use of string concatenation to hide API calls are common techniques for dropper malware.

Heuristics 10

  • 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-5303061-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-5303061-0
  • 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
eb92f1132871ae0fddf20e5ee26a623d43701f745935a070d5370dc5024d51cb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x392 4070 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_off000285e3.bin
1fe1849fd088a648ec207afb8286940bf8146dca8af878a82215c65d384ce87b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x285E3 108424 bytes
font_01_sfnt_off000377da.bin
002b636d32483203401744d2639294a3ace3c55cfaf468db37fb2400f977ae39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x377DA 51792 bytes
font_02_sfnt_off0003d7c1.bin
8c7780e13a82162e9255f02209f125f57c044f111aa8a0ddd34f7a00aa655d14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3D7C1 21396 bytes
polyglot_child_pdf_off00017c7f.pdf
830855869923a73709a8ea90148c5edb21965cecf57e6b604c0e5d8e3317652f		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x17C7F 173502 bytes
polyglot_child_pdf_off00040a50.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x40A50 6125 bytes

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