PDF malware analysis — malicious · 5d251521b1753c30

MALICIOUS

PDF

1.4 KB

MD5: bf43a1ad9dcd3668f5f18bb06ffde08c SHA-1: bb5ad3b3d22aa394a6059f10d8d529d787d478b1 SHA-256: 5d251521b1753c3086c93c9d02b9d0fdff5e01e3dc295208849461014d9f91c7

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 method. The JavaScript code is heavily obfuscated but appears to construct a large string and then attempts to execute it, likely to download and run a secondary payload. The critical heuristics related to PDF JavaScript exploits and the specific CVE strongly indicate this attack pattern.

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` `cd5f0edafd69a18d5513552b7365c3b81d743f567c73b79edfe5a4d14e252bf6`	pdf-javascript-stream	PDF /JS object 111111 at offset 0x160	1240 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` `19be0300284ae4caf35ed07ff08842b04a404f38f987ad257ab11d68f4520d86`	pdf-javascript-stream	PDF /JS object 111112 at offset 0x480	252 bytes
`combined_document_js_000.js` `3371e095c1a2bc80a352f76f41a7cb9399c926dc84f3e89712afbf14f4581697`	deobfuscated-js	combined document JavaScript streams at offset 0x160	1493 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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