PDF malware analysis — malicious · a0284f15584c1a24

MALICIOUS

PDF

43.3 KB

MD5: d6c37c9e6ebae4b4b8024944d1ae15e6 SHA-1: 94d85f96e6f233d1e54d72e0722122e87cbb2fa9 SHA-256: a0284f15584c1a24ea0ebd2c05eaf7232135c32574bbcc4aa7fc1b908e5473bd

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 JavaScript

The PDF sample contains embedded JavaScript and triggers the CVE-2009-4324 vulnerability via the media.newPlayer API. The ML classifier strongly indicates maliciousness. The embedded JavaScript, particularly in legacy_pdfkit_stage_000.js, appears to be obfuscated but is designed to execute further malicious code, likely a downloader for a second-stage payload. The specific exploit used is CVE-2009-4324.

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` `e7c0a8af6a50eb96e3838f321f2fce12cde7f3171012bd5c750e8cb0f64074ad`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2221 bytes
`legacy_pdfkit_stage_000.js` `34724b4176b0e989bf73d0fc9ae205c6fc8236b3698a34a94365aab3ab91b629`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xAC8	2756 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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