PDF / .02 malware analysis — malicious · c8decc56b1fe0e1a

MALICIOUS

PDF / .02

99.5 KB Created: 2010-06-29 10:14:47 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)

MD5: 3aed2adc1018d4c39080ab412e26654c SHA-1: eac0b4c09c1b737b4aa4fa5138180f4865b7c61c SHA-256: c8decc56b1fe0e1a5ee988cc9b71f10be2dd4aa0184c12dd69c9da9d3cf39a64

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that is obfuscated and utilizes the unescape() function, indicating malicious intent. The critical heuristic firing for CVE_2009_4324 specifically points to the exploitation of a known vulnerability in Adobe Reader via the media.newPlayer API. This suggests the primary goal is to execute arbitrary code, likely to download and run a secondary payload. The presence of a secondary embedded PDF further supports 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.
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.
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.

Filename	Kind	Source	Size
`javascript_obj0021_000.js` `53f544968c1bba00222eb6d69c006f180903457bc02960590c073774f4b4ee91`	pdf-javascript-stream	PDF /JS object 21 at offset 0x514	2371 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 2 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 0x514	126 bytes
`font_00_sfnt_off00010e33.bin` `b8d666f3952aa31f2bed9bee833273cbf81c0fa90ad84d7961270821b5dd0ba6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E33	39884 bytes
`font_01_sfnt_off00014ba7.bin` `677273497f979c1e4f9451b20c59cd1e074d4930aa1d3d2c4b31d56e6b401faf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14BA7	20336 bytes
`polyglot_child_pdf_off000066fa.pdf` `f8a991732c0956677cb0bf1e397a2d02315a3f7d2164e6ea72364a7e50453f83`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x66FA	75485 bytes
`polyglot_child_pdf_off000175ea.pdf` `0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x175EA	6125 bytes

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