PDF malware analysis — malicious · 73a5db1189a9a901

MALICIOUS

PDF

1.8 KB

MD5: 264ca480c4f8f87151cfb1575a839796 SHA-1: 98e9fd9b37ef3877143d075a54a63125aff9c059 SHA-256: 73a5db1189a9a9013bd39957dc1203129b12b19c15cac6e15d7240fce2b93e71

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that leverages the unescape() function and exploits CVE-2009-4324 via media.newPlayer. This JavaScript is designed to trigger a heap overflow vulnerability, leading to arbitrary code execution. The ML classifier and specific heuristic firings strongly indicate malicious intent.

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.
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
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `e3619988bf683cbe3bd946ee1020cb2ac396c9b5c9d7027b7b044eaa7ca6545e`	pdf-javascript-stream	PDF /JS object 5 at offset 0x117	1322 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`combined_document_js_000.js` `10556f147aadc6de6ab28a47599779f910310f683776c716e07a1ca4571d966e`	deobfuscated-js	combined document JavaScript streams at offset 0x117	1353 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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