PDF malware analysis — malicious · 597b8d89d4e962d0

MALICIOUS

PDF

21.3 KB

MD5: ce9600327caf638588176db3003fe831 SHA-1: 7b966623f29929b6131297a0c37ebfaba8adbad5 SHA-256: 597b8d89d4e962d020d3872fb043087c0ac56bb4a8f5e1d5c373f59cd633e412

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, flagged by multiple heuristics including a critical alert for CVE-2009-4324. The ML classifier also strongly indicates maliciousness. The embedded JavaScript, specifically the deobfuscated file 'legacy_pdfkit_stage_000.js', appears to be responsible for exploiting the CVE and likely downloads a second-stage payload. The obfuscation indicators and the nature of the exploit suggest a downloader or initial access stage.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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` `71b262839fdfb98ad878e821d1365419a17d4eda19d4a1b80ffd92a4fe6f7603`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2553 bytes
`legacy_pdfkit_stage_000.js` `d3ea704608df86af97d886f34e3a097ec6a4e9ac32223f3de4341a8dbd495319`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xC14	1232 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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