Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc121d5bb41e172e…

MALICIOUS

PDF

121.2 KB Created: 2010-03-15 20:30:50 +08:00 Authoring application: Writer (via OpenOffice.org 3.0)
MD5: 9d73e705bfda78dc60076e12a016af21 SHA-1: 88d8a17aef7c2ced2cbb753e7663baaf7b3db77e SHA-256: dc121d5bb41e172e06bb08e9d43bb286d0bd5de5cb8a56e84bf0b0a99476b4bf
196 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that is obfuscated using unescape() calls, indicating malicious intent. The critical heuristic 'CVE_2009_4324' specifically points to the exploitation of a known vulnerability in Adobe Reader via the media.newPlayer API, which is triggered by the embedded JavaScript. This suggests the document is designed to download and execute a secondary payload. No specific malware family was identified.

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/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000063a.js
ad2faefcc30021633aaf358ca5c30f7f09e50773ed7f1db8b3e4973585328ccc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x63A 2578 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_off00019865.bin
975b57b9bfc77fc0319a1d8d2b6eee25fcde2e0d69a041e1a8d97e8721908a42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19865 2440 bytes
font_01_sfnt_off00019e87.bin
b8bf3092fa2f75279d51530187fb22ae9caff35232b8aeb731c4d8e0c26e3b42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19E87 21900 bytes
polyglot_child_pdf_off0000e1fb.pdf
31d12ad31f3472b55e1289ccbd9897099e951d68cf58832bd9cd0655f8a603c6		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xE1FB 66224 bytes
polyglot_child_pdf_off0001ccbe.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1CCBE 6125 bytes

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