PDF malware analysis — malicious · 114bce3339d1b1d4

MALICIOUS

PDF

1.4 KB

MD5: fea0b21146276aaf765746e1c4bf807a SHA-1: b906d4d0f4b6e6620b6489c56fbd706eb7eb1896 SHA-256: 114bce3339d1b1d443d01de81d1a489cda4fcf4d0b9a75e856a852e6069c3f58

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 (media.newPlayer) to achieve code execution. The JavaScript is heavily obfuscated using unescape functions and string concatenation, indicating a malicious intent to download and execute a secondary payload or exploit the reader. The ML classifier also 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` `f123d69af3f084422f5a42860893b321db1ba40f2d4624ababb1df3447ce8bfa`	pdf-javascript-stream	PDF /JS object 111111 at offset 0x160	1258 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` `67c5df5417e8fe2509d5f3b4de752b2299efcb848462da231e95b7a49c1f819b`	pdf-javascript-stream	PDF /JS object 111112 at offset 0x489	251 bytes
`combined_document_js_000.js` `c42e740153243daa4068f4d855ec11ee46e03f70ebd33e9e5084c55332d50787`	deobfuscated-js	combined document JavaScript streams at offset 0x160	1510 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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