PDF malware analysis — malicious · 4b4c43f5a0d4e5de

MALICIOUS

PDF

43.3 KB

MD5: 4157178cd125cc80818f0939cde368e6 SHA-1: 77da95038d159ecad63be96409faff6982dafd7d SHA-256: 4b4c43f5a0d4e5deb0a231365c3f08f520ae7aacff7db6c2f4293e761687c866

78 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The critical 'CVE_2009_4324' heuristic specifically points to a known vulnerability related to media player actions within PDF annotations. The deobfuscated JavaScript, identified as 'legacy_pdfkit_stage_000.js', likely facilitates the exploitation of this CVE to download and execute a secondary payload. The presence of obfuscation indicators in the extracted artifacts further supports this assessment.

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` `4291b500dbc9384f2941a8498be308ce7408d1d0ca965a02cfc2aee46100f9f0`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2205 bytes
`legacy_pdfkit_stage_000.js` `34724b4176b0e989bf73d0fc9ae205c6fc8236b3698a34a94365aab3ab91b629`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xAB8	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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