PDF malware analysis — malicious · 601ca96b3b7957ec

MALICIOUS

PDF

1.4 KB

MD5: 1b3e6fa064353a151f8c2acb04e4031c SHA-1: beb30702f699d3672140eba1587d6e90c3b64350 SHA-256: 601ca96b3b7957ecf458d766d02776d9913aadc73274e9ffe8016a50a168721e

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded and deobfuscated JavaScript that leverages the unescape() function and exploits CVE-2009-4324 via the media.newPlayer object. This JavaScript is designed to construct a large string and then attempt to trigger the exploit, indicating its purpose is to download and execute a secondary payload. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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)
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.
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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111111_000.js` `9d267e7022e0d08e1ceb9d4ecd6e6e78f66ac8866c1164af5a3af0edae7fcc02`	pdf-javascript-stream	PDF /JS object 111111 at offset 0x160	1265 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).
`javascript_obj111112_001.js` `36f626ddab432e3728727e21f3c9a87c11902c55c3bb905271939d3f69ad46de`	pdf-javascript-stream	PDF /JS object 111112 at offset 0x486	265 bytes
`combined_document_js_000.js` `151a787c97dfdc5bcb96a08621dd5d77492f69eef894cfc9a717247366e17691`	deobfuscated-js	combined document JavaScript streams at offset 0x160	1531 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).

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