PDF malware analysis — malicious · dbc05c55956a079e

MALICIOUS

PDF

79.1 KB

MD5: ee290cf23432aad38b1c94632859fa8a SHA-1: 0c985bd9a8fe8a64a1ef7bfb201f9f8c1b5e58f2 SHA-256: dbc05c55956a079e125c1bf9580504cbd2356b562a5f74d0d8adde9f017f5c85

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File

The PDF sample contains embedded JavaScript and triggers the CVE-2009-4324 vulnerability via the media.newPlayer annotation. The ML classifier strongly indicates maliciousness. The embedded JavaScript, identified as legacy_pdfkit_stage_000.js, is likely responsible for further stages of the attack, such as downloading and executing additional payloads.

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` `ab4e271600d697f72ee7168f0b6eb610e04f5fcd532db107d5336a79d706d636`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3583 bytes
`legacy_pdfkit_stage_000.js` `dbb326f9ab28c24e745edc41cf3827e86e38227fd6b1b28860c777c5d18f5ae1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x101A	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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