PDF malware analysis — malicious · 66c1e448377212a1

MALICIOUS

PDF

177.3 KB

MD5: e3c830bd470e7c87ef6584aa371704a7 SHA-1: b9f11e256963c10634ca80d216eb93d6a40cd3cc SHA-256: 66c1e448377212a1c6f96cfbd4a50b8531f4e9ecfb9930a485585f9e5ee00aa9

226 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 exploits CVE-2009-4324, specifically targeting the 'media.newPlayer' function. The JavaScript is heavily obfuscated but appears to be designed to download and execute a secondary stage. The critical heuristic firings related to PDF JavaScript exploits strongly support this conclusion.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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. (identified after JavaScript deobfuscation)
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)
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `9a3d31586281e6394f2261f59cdd3ac424a12a573dfb23d8b4e09a0faa5f7c9f`	pdf-javascript-stream	PDF /JS object 8 at offset 0x210	2960 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 3 long hex-escaped blob(s).
`legacy_pdfkit_stage_000.js` `42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74`	deobfuscated-js	string-concatenation normalized Acrobat API aliases at offset 0x210	126 bytes

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