PDF malware analysis — malicious · 5b714bc0f68c58fb

MALICIOUS

PDF

1.4 KB

MD5: 40d416b315431da48d6bc6f6117f8328 SHA-1: 88538a91d7f2b64ed37de5336dafe7d6eedf815b SHA-256: 5b714bc0f68c58fbb5a35bb3a0e966372154118b01fe59128cb94cdaacbd2782

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 unescape() function and exploits CVE-2009-4324 via the media.newPlayer method. This JavaScript is designed to download and execute a second-stage payload, although the exact nature of the payload is not discernible from the provided evidence. The critical heuristics related to PDF JavaScript exploits and the specific CVE 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. (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` `44943ef26a282104a5ddd2d53de858e7837d58b93e1485cdd1a2ba86b3b7e95a`	pdf-javascript-stream	PDF /JS object 111111 at offset 0x160	1231 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` `f8b02b0a7381317d9df64a6f2e77654e0703d2ec83abfd49b2d7f6dcac3673ee`	pdf-javascript-stream	PDF /JS object 111112 at offset 0x47C	246 bytes
`combined_document_js_000.js` `1c56761c401b8ac8a668d72de56aed24d5b5db82b96093bc7b4fde55bdfb8596`	deobfuscated-js	combined document JavaScript streams at offset 0x160	1478 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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