PDF malware analysis — malicious · fd1bb795223e3821

MALICIOUS

PDF

79.1 KB

MD5: 413b1925b1324a33c960ee58d1ed6b7f SHA-1: 0130f6449155a333a203ffee798c347d5a216830 SHA-256: fd1bb795223e3821a0a4252db3da3f412f7d006e8a20655a04fbd5ed2214f774

78 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2009_4324 heuristic specifically points to the exploitation of a known vulnerability using the media.newPlayer API. The deobfuscated JavaScript, found in legacy_pdfkit_stage_000.js, likely facilitates the execution of malicious code, potentially downloading further stages. The extracted JavaScript and the CVE exploit suggest a common PDF-based malware delivery mechanism.

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` `97d0bfcf382ff3a56a1d75b11a074f4331901bf3ced1f12fddba1deca6e37f6f`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3583 bytes
`legacy_pdfkit_stage_000.js` `5cbf7c5d724ab4b937e80f072f90f13dd3fc34289233ac42b937c90a2014dfb1`	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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