PDF malware analysis — malicious · 7959d550041c658f

MALICIOUS

PDF

211.8 KB

MD5: dbc62c9df69f8554024043cbe42474b3 SHA-1: a837ea8f881eaa95fb9c9d7169bdb5e99a70010d SHA-256: 7959d550041c658fec7f908d11f8eed9f9fa4c93bc9c6cf2057e8f435ca01076

352 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that utilizes eval() and unescape() functions, indicative of exploit code. Critical heuristics confirm the exploitation of CVE-2009-4324 via the media.newPlayer method. The JavaScript is heavily obfuscated but appears to be designed to download and execute a secondary payload, as suggested by the generic stage recovery findings.

Machine Learning

Nyx PDF Classifier malicious score 0.9984

Heuristics 11

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)
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
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.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Suspicious extracted artifact info 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.
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 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0052_000.js` `45fea71ee6347153ec3719ebc3910509cd6fa568f263c29e7474c694308f5c7d`	pdf-javascript-stream	PDF /JS object 52 at offset 0x3F4E	301 bytes
`javascript_obj0059_001.js` `480b0613f4e3c93c5538766bc6ad095eead1a5b8229e2dff8b199fe31ca49d57`	pdf-javascript-stream	PDF /JS object 59 at offset 0x6483	2611 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
`stream_005_off00000b74.bin` `e4217c167299ac63f64b8b7e903cc0196f0828693d273431b8b793a12ed0fed3`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xB74	1000 bytes
`generic_stage_recovery_000.js` `3d127f9e2519a8e3fc3a8ed1484977a653c59b58bb3cb36a978a623d7f421475`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 59 at offset 0x6483	2599 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
`generic_stage_recovery_001.js` `ddaab2ef36a25e8f74a245f09c69f5ad9b161f409a6f7dae63a474b493611063`	deobfuscated-js	generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0x3F4E	2901 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
`generic_stage_recovery_002.js` `9cdc3c91e92801993b3126e701460b3ff0d4a53ae4b3bde46a58d0bcd1065606`	deobfuscated-js	generic stage recovery null-collapse -> split-literal-normalize from combined JavaScript objects at offset 0x3F4E	2603 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
`objstm_0053_00.bin` `f9797d0fa28384c30d8bf1da89163104ce539753e417fa1f9c5fd135d1eceb39`	pdf-objstm-decoded	PDF /ObjStm 53 0 obj (inflated)	50 bytes
`polyglot_child_pdf_off0002e382.pdf` `37d933ad18da515523d7d58fee6a79df36ff774c79d98e945313faee99b66a29`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x2E382	27574 bytes

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