PDF malware analysis — malicious · 0ba495aa26aff6f3

MALICIOUS

PDF

87.6 KB Created: 2009-12-21 16:55:35 +08:00 Authoring application: Acrobat PDFMaker 7.0ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿcer(Acrobat Distiller 7.0 (Windows) (via Acrobat Distiller 7.0 (Windows))

MD5: 493b86c2a00d130e1ebb107ed8713863 SHA-1: 82004787f4c9c8b6fe6165c00f39502e83dc91ec SHA-256: 0ba495aa26aff6f379ea46317e2875063dbdddaa0063d19b06a21f98628076ef

292 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exploits the CVE-2009-4324 vulnerability related to the media.newPlayer object to execute embedded JavaScript. The JavaScript code, which uses eval() and unescape() for obfuscation, is designed to download and execute a secondary payload. The ML classifier strongly indicates maliciousness, and the presence of exploit-related heuristics confirms the attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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.
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/pdf/1.3/
- http://ns.adobe.com/pdfx/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/photoshop/1.0/

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0043_000.js` `936e2fe1881cc08af3c77ee20ad39a53e4e5331c62787a3c3455c03a63223df6`	pdf-javascript-stream	PDF /JS object 43 at offset 0x2430	2172 bytes
`javascript_obj0043_001.js` `ad00489fb099dbbe2f8189405c957e21d283c53b58a6f6ac932472b851dd9c9a`	pdf-javascript-stream	PDF /JS object 43 at offset 0x2465	6484 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 21 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_000.js` `3de18d643bbbfed4f5e975007e20182dadadd1ddc7157ec7a58d63e1ae628ffc`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 43 at offset 0x2465	6472 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 21 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_001.js` `aa08a6046c37a2c6bc52361ff13fa9e64c4b6316087d9ec67da6d49f23f8e3a2`	deobfuscated-js	generic stage recovery marker-XX-to-%u from JavaScript object 43 at offset 0x2465	5859 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 21 eval/decoder/string-building token(s).
`generic_stage_recovery_002.js` `3c763ae8d12646cf96aae88fe53615d8f63f2846394a3d827bfa6698a5af60a2`	deobfuscated-js	generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0x2430	8645 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 21 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_003.js` `426159a7abbfc96cfc9f011196abdb71becccce0b83f6ff9457fc5766c986452`	deobfuscated-js	generic stage recovery split-literal-normalize -> marker-XX-to-%u from JavaScript object 43 at offset 0x2465	5847 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 21 eval/decoder/string-building token(s).

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