PDF malware analysis — malicious · 022793b15650b4aa

MALICIOUS

PDF

1.4 KB

MD5: 763276e916ac392db82b5f46558eb29f SHA-1: fbd427ec481783f62188cbbb55e87396ae76d68c SHA-256: 022793b15650b4aac0b8685e25cbb2c743e31bd2780c61fc197cc0c1dd8cbcb5

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability (media.newPlayer) to execute arbitrary code. The script attempts to construct a URL by concatenating strings and then likely uses this URL to download and execute a secondary payload. The ML classifier strongly indicates maliciousness.

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` `12c34af4df78d7bc846b5390f2cd3e5f2a1ef918f55dbfdb6e4dd811447b05ca`	pdf-javascript-stream	PDF /JS object 111111 at offset 0x160	1277 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` `041bf00a6589f9472328adee450c0da97396251df2b8d36dfe33c0bcd5acfa66`	pdf-javascript-stream	PDF /JS object 111112 at offset 0x494	262 bytes
`combined_document_js_000.js` `ad89c7e7fb0e8057b1b533b310c33029e4a14de9179776f0d4c226f1b590a497`	deobfuscated-js	combined document JavaScript streams at offset 0x160	1540 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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