Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dcb218e9a536c38…

MALICIOUS

PDF

113.9 KB Created: 2010-05-17 09:37:20 +08:00 Authoring application: Writer (via OpenOffice.org 2.2)
MD5: 32861f8487638e1bb0bfb5a54ce8fce0 SHA-1: dc41c3bcb5facbf89fa215179ee109d226d62947 SHA-256: 1dcb218e9a536c3848f32658b6bd702591c7d46c8eb96731a56e83d089315209
196 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits CVE-2009-4324, indicated by the 'media.newPlayer' heuristic. The JavaScript is obfuscated but the exploit suggests it's designed to download and execute a secondary payload. The presence of a secondary embedded PDF also points to a multi-stage attack. No specific family could be 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000329.js
849253170e90afede6a28e01ab66b73a431afbf7e5ae5f92c5d10e7f9e9099a8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x329 2677 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 0x329 126 bytes
objstm_0024_00.bin
5e33c5e97bbc41469ea4328ae48aa20389a4ed5a4c9608e42a4e56b7bc98859c		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 332 bytes
font_00_sfnt_off000157c7.bin
4c9b4ba1ca73448a72421f7f9179159401076174a079afab1f90534eca98fff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157C7 31868 bytes
polyglot_child_pdf_off0000a1f1.pdf
b6919e35a2cb3b7ac0927c9664fc74fae86d5d0c6b7762ce0ed1fac9ee07c419		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xA1F1 75127 bytes
polyglot_child_pdf_off0001af7b.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1AF7B 6125 bytes

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