PDF malware analysis — malicious · 41b7db868f5b2a84

MALICIOUS

PDF

79.3 KB

MD5: ea048331cf2e6070afdffd10ac5f7798 SHA-1: 647334fbaff81887ea8b8dc5b9d6522bff86975d SHA-256: 41b7db868f5b2a84261bb0de1926621464911ed2e411a9a1c70bec1f89f1e69a

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File

The PDF sample contains embedded JavaScript, flagged by multiple heuristics including a critical alert for CVE-2009-4324 (media.newPlayer vulnerability). The ML classifier strongly indicates maliciousness. The deobfuscated JavaScript, named legacy_pdfkit_stage_000.js, likely serves as a downloader for a second-stage payload, exploiting the identified CVE. The document body content is not directly indicative of a specific lure.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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)
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_obj0008_000.js` `df52b7bbba68e669e725f89703d95509caf5cd9a8c7244239fb986d8c7c75e50`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3766 bytes
`legacy_pdfkit_stage_000.js` `2ef8c6f32578b2c33ae54b85f595204edb0c24180c1b62b22cda8474f61d0a09`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x10D1	2552 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `42025b552c7960b53abcd8cd732b01c8d109eccfdfefc352b9826c4d5807d414`	deobfuscated-js	cross-stage annotation API aliases at offset 0x1E7	81 bytes

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