PDF malware analysis — malicious · a2530d181a7e162f

MALICIOUS

PDF

350.8 KB

MD5: d56e60a0cddae6813337713e31d08317 SHA-1: d0e345308e2a9f7e32dc24499c5ce96f2805c1af SHA-256: a2530d181a7e162f23ddde8653a661fcda0bc891f86bbaea1d7ba5cb55d490ed

412 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes `eval()` and `unescape()` functions, indicative of obfuscation and exploit execution. Specifically, the `media.newPlayer(null)` call is associated with CVE-2009-4324. The JavaScript is designed to download and execute a secondary payload, as suggested by the generic stage recovery findings. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9984

Heuristics 12

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.
ClamAV: Pdf.Exploit.Agent-21043 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-21043
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 11

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` `28d6113dc29ef94de179a1345b6983a9d947da00c945e958d0554de4748a5164`	pdf-javascript-stream	PDF /JS object 59 at offset 0x6483	2612 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` `9386c3619dcf3abffde858874a5e2addc7b978e0fab02276372073d35a49ec7e`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 59 at offset 0x6483	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).
`generic_stage_recovery_001.js` `62f4a84d348a420fc4b48f414738b4fd41d98489a85772d27fa213bc38a65240`	deobfuscated-js	generic stage recovery marker-XX-to-%u from JavaScript object 59 at offset 0x6483	1801 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`generic_stage_recovery_002.js` `c98e5d5c6978a8436869c766df67ad7f3c5b444455dd5b7235fa945bbcddbe6d`	deobfuscated-js	generic stage recovery marker-XX-to-%u from JavaScript object 59 at offset 0x6483	1365 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`generic_stage_recovery_003.js` `f794d147fe21cdced2642a43d59ce19e96211c79e1866fcfb6a0da7a2be9584e`	deobfuscated-js	generic stage recovery null-collapse from combined JavaScript objects at offset 0x3F4E	2616 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_004.js` `41c086683794a69b4cf08a67b67fe1f8532e2dee0f9c252c8ea9af05b45a0043`	deobfuscated-js	generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0x3F4E	2905 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_005.js` `44be16306ab8eb4e46402a04d83620d6ec307426880c37d358161066d31b33bf`	deobfuscated-js	generic stage recovery null-collapse -> split-literal-normalize from combined JavaScript objects at offset 0x3F4E	2607 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_off00050f61.pdf` `fb2b52d852722f9b426665a5f60047fc463cd643a8f13b317d15efab7307f861`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x50F61	27574 bytes

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