PDF malware analysis — malicious · 0f42da7a7f39143f

MALICIOUS

PDF

183.4 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: c2fc72ade93076ae14af4de1e45e127b SHA-1: f05fb0a72b4e2c2dd2f056cec90f2c6d64397992 SHA-256: 0f42da7a7f39143f31fc76df744f12d673bbaba1fc3fb365f823b2621382b570

252 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that is heavily obfuscated and utilizes the unescape() function, indicative of exploit code. Critical heuristics indicate exploitation of CVE-2009-4324 via the media.newPlayer object. The JavaScript is designed to download and execute a secondary payload, a common technique for initial stage malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9988

Heuristics 9

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.
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0043_000.js` `6a4feff50242ca48bccb7b8303874c63d44c492cea43499d20ce94d354dc031d`	pdf-javascript-stream	PDF /JS object 43 at offset 0x2430	2172 bytes
`javascript_obj0043_001.js` `72a7a81874bc825243697fb1380a9dc969da68bf826f90ff5241fdd360dd07a9`	pdf-javascript-stream	PDF /JS object 43 at offset 0x2465	6463 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 20 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_000.js` `16ae11897d85015a75a4476aa5d780ff0fb25880746f1a6e954a1c4f5329200c`	deobfuscated-js	generic stage recovery marker-XX-to-%u from combined JavaScript objects at offset 0x2430	5838 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 20 eval/decoder/string-building token(s).
`combined_document_js_000.js` `6b274891890bf0d519e3384adb17e8bb7394a4452b3b364e01a340896daea0d1`	deobfuscated-js	combined document JavaScript streams at offset 0x2430	8636 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 20 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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