PDF malware analysis — malicious · 03f31c3d3c6d87a2

MALICIOUS

PDF

78.2 KB

MD5: a604d344256df09fa8ceaba46f5b4463 SHA-1: c9a4f6ef413640a6cd757d7208102e31bd6e4bf0 SHA-256: 03f31c3d3c6d87a255d5495223c216c3d9d104ba5b72109e95cc68e79cf69cb7

312 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that exploits CVE-2009-4324 (media.newPlayer). The JavaScript is heavily obfuscated but appears to be designed to download and execute a secondary payload. The presence of multiple JavaScript exploit clusters and generic stage recovery heuristics indicates a multi-stage attack. No specific malware family could be confidently identified.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

Heuristics 10

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.
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 9

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0057_000.js` `d4576796ac2b42138ca98b27ab9c0a9b6673cca2ccf88698b073c9f440728031`	pdf-javascript-stream	PDF /JS object 57 at offset 0x551F	30789 bytes
`javascript_obj0057_001.js` `4389c8d7cc81cec8815aa2ea9c9e32c15c795ddcef36c7e70ab3d6fb4a41e8b5`	pdf-javascript-stream	PDF /JS object 57 at offset 0x5555	2186 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 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` `51a89d769482a190889d1b511f84c7fe1ed3c7636666bb61f16f4d7048e64e0e`	deobfuscated-js	generic stage recovery marker-XX-to-%u from JavaScript object 57 at offset 0x5555	1695 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `c9b8a7c295079cf5a3c1ae39ea040802db0f809216a4c7091daaced40260280d`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x551F	32968 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`combined_document_js_000.js` `90199d2be30919e87694084dab7ad227b1805bcbd4917af03d0cb980d0623996`	deobfuscated-js	combined document JavaScript streams at offset 0x551F	32976 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`objstm_0053_00.bin` `f9797d0fa28384c30d8bf1da89163104ce539753e417fa1f9c5fd135d1eceb39`	pdf-objstm-decoded	PDF /ObjStm 53 0 obj (inflated)	50 bytes
`javascript_obj0057_000_1.js` `63075680bf839574d5b03242bf63848b9d56e7ef04f741f0907023f8772072cc`	pdf-javascript-stream	PDF /JS object 57 at offset 0x5555	904 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`polyglot_child_pdf_off0000cd16.pdf` `6f803eea1a135be64c263d822ef2bdb0bb6e45baab5ad5a7d82ce8106c61e1f2`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0xCD16	27598 bytes

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