PDF malware analysis — malicious · 78c0922c3b6c9c00

MALICIOUS

PDF

1.4 KB

MD5: ad21f7144d495432f427c79dcad24be7 SHA-1: 01db1db443748be27e7531090051665467f54185 SHA-256: 78c0922c3b6c9c00e6235371341b2bd9a911749685c89295ea68ef631d209f44

208 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() function. This JavaScript is heavily obfuscated but ultimately attempts to exploit this known flaw to execute arbitrary code. The ML classifier strongly indicates maliciousness, and the specific exploit identified points to a client-side execution attack.

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` `3cb143c545c18548a997094e4114e3b3191021bbb4433b5dd95e236c35fd779b`	pdf-javascript-stream	PDF /JS object 111111 at offset 0x160	1264 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` `8309098dddda795734990b43800c7a0bad6250314f2f66798a3c4cf181826ebd`	pdf-javascript-stream	PDF /JS object 111112 at offset 0x487	251 bytes
`combined_document_js_000.js` `62235b0805adac6de39c70ec07d4eccacb8ca76f35fed678487292490aa46efc`	deobfuscated-js	combined document JavaScript streams at offset 0x160	1516 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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