MALICIOUS
372
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1059.007 JavaScript
The PDF file contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability via the media.newPlayer method. The JavaScript is heavily obfuscated but appears to be designed to download and execute a secondary payload, as indicated by the 'generic stage recovery' and 'PDF JavaScript exploit cluster' heuristics. The ClamAV detection name further supports its classification as a dropper.
Machine Learning
- Nyx PDF Classifier malicious score 0.9988
Heuristics 11
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media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324PDF 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)
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PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTERPDF 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.
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Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGEA 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.
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ClamAV: Pdf.Dropper.Agent-7228829-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Dropper.Agent-7228829-0
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unescape() call high PDF_UNESCAPEunescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERYBounded 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.
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JavaScript action low PDF_JAVASCRIPTPDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Embedded JS stream low PDF_JSPDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTALThe 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.
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Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGEOne 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.
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Embedded URL info EMBEDDED_URLOne 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 7
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0052_000.js45fea71ee6347153ec3719ebc3910509cd6fa568f263c29e7474c694308f5c7d |
pdf-javascript-stream | PDF /JS object 52 at offset 0x3F4E | 301 bytes |
javascript_obj0057_001.js525a25e1b66ec2bfe53b584887b4f54d069836c2a2d7f67050b50197ca396ab1 |
pdf-javascript-stream | PDF /JS object 57 at offset 0x5500 | 2522 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
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stream_005_off00000b74.bine4217c167299ac63f64b8b7e903cc0196f0828693d273431b8b793a12ed0fed3 |
decompressed-pdf-stream | PDF FlateDecoded stream at offset 0xB74 | 1000 bytes |
generic_stage_recovery_000.jsbb1c9f964450e42c3117fe18ee24add1a858d5b4127d5ee9426c887c42667e0e |
deobfuscated-js | generic stage recovery null-collapse from combined JavaScript objects at offset 0x3F4E | 2526 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
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combined_document_js_000.js42417d31cf7ff8dddf7e43e9ea866f871a3acf881963c33d99cddf53d59d63d3 |
deobfuscated-js | combined document JavaScript streams at offset 0x3F4E | 2824 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
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objstm_0053_00.binf9797d0fa28384c30d8bf1da89163104ce539753e417fa1f9c5fd135d1eceb39 |
pdf-objstm-decoded | PDF /ObjStm 53 0 obj (inflated) | 50 bytes |
polyglot_child_pdf_off000436ae.pdfddca2a6a089d3b8fc4911be41f3f45247ba99ae25297ed4039e7661c9237482e |
polyglot-child-pdf | Secondary PDF body inside pdf container at offset 0x436AE | 27691 bytes |
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