Malicious PDF — malware analysis report

Static analysis result for SHA-256 473b9f9e36171dc2…

MALICIOUS

PDF

153.0 KB Created: 2010-06-29 10:30:35 +08:00 Authoring application: PScript5.dll Version 5.2.2 (via GPL Ghostscript 8.15)
MD5: c3b1c8b4aced8f5b112721f233a1a08e SHA-1: 1beafc2bf31ef66bf7db5218f98fdfeadca79533 SHA-256: 473b9f9e36171dc267c536f2991247b35c770c68a7404f5b17dadb50fc7b4760
244 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and is flagged for exploiting CVE-2009-4324, a known vulnerability related to media player handling in Adobe Reader. The embedded JavaScript is obfuscated but likely serves to download and execute a second-stage payload. The presence of multiple embedded PDF objects and static triage findings further indicate malicious intent.

Heuristics 9

  • 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.
  • 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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000392.bin
d91680ee53e3382f617eec7c55cc7bb4f06eb20eefb03c68ac5e856009ee882a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x392 4264 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).
stream_011_off00022686.bin
26af9a104d71730866baa367d3ee2057d6b03df15f340b81dd9d3ebd574ab19f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x22686 2903 bytes
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_01_cff_off000230f2.bin
b12fb34baf12050254b771e1c032b63a3f72143e1e23b7608f80b70fdd9811ec		 pdf-font-stream PDF embedded font (cff) at offset 0x230F2 5170 bytes
polyglot_child_pdf_off0001e6a3.pdf
fe0f2a192f6a6ca89051d65f381e621f8a0216941f34e041b89419b12aca5257		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1E6A3 32086 bytes
polyglot_child_pdf_off00024c0c.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x24C0C 6125 bytes

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