PDF malware analysis — malicious · 65037efd24239608

MALICIOUS

PDF

591.5 KB Created: 2009-07-08 10:53:46 +08:00 Authoring application: Acrobat Distiller 7.0 (Windows)

MD5: a3ae4c9b51343163aac9a6178c46b4fe SHA-1: 3d88f19422d895acb61afc944b54c49b52211391 SHA-256: 65037efd2423960859c567b79368b4c000769b074602c604cf55e8a0a0a9e01f

368 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file is a polyglot containing both a PDF document and a ZIP archive. The ZIP archive contains two exploits, CVE_2009_4324 and CVE_2010_3333, targeting PDF readers. The embedded JavaScript is heavily obfuscated but appears to be responsible for triggering these exploits and likely downloading a secondary payload. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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. (matched in decompressed stream)
CVE-2010-3333 — pFragments RTF stack overflow critical CVE exact CVE_2010_3333

RTF shape property pFragments has an oversized value, matching the CVE-2010-3333 stack-overflow trigger in Microsoft Word 2002/2003.
PDF/ZIP polyglot carries child CVE exploit critical POLYGLOT_PDF_APPENDED_ZIP_CVE_BUNDLE

The PDF contains an appended ZIP archive after %%EOF, and at least one ZIP member independently matches a CVE-specific exploit rule. Report this as a bundled multi-exploit delivery package rather than as an unrelated archive artifact.
ClamAV: BC.Legacy.Exploit.CVE_2010_3333-5 critical CLAMAV_DETECTION

ClamAV detected this file as malware: BC.Legacy.Exploit.CVE_2010_3333-5
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
PDF with appended ZIP archive high POLYGLOT_PDF_ZIP_APPENDED

A ZIP local-file header was found AFTER the last %%EOF in this PDF — a polyglot pattern where the same bytes are a valid PDF for a PDF reader and a valid ZIP for an archive parser.
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/pdf/1.3/
- 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/pdfx/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0017_000.js` `fec02ac84241a606ddee84042d46f183d5a3e8bc4f3fce27d6a568b328437545`	pdf-javascript-stream	PDF /JS object 17 at offset 0x4DD	2944 bytes
`generic_stage_recovery_000.js` `798319c5fb36218270198f3d097dd6c298b2d09d5d838caf46439648ebc871f7`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 17 at offset 0x4DD	2780 bytes

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