PDF malware analysis — malicious · c5a886f803b92363

MALICIOUS

PDF

79.1 KB

MD5: 8d6a42561503398b4c440e0f56adecbc SHA-1: a771e761962f654563bcf4cd484b1d6f6e12cf00 SHA-256: c5a886f803b92363605e430161648aae345a59c42812cb01d68da808860865c8

78 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. A critical heuristic identified the CVE-2009-4324 exploit related to media.newPlayer, suggesting a known vulnerability is being leveraged. The deobfuscated JavaScript, found in 'legacy_pdfkit_stage_000.js', likely facilitates the execution of a second-stage payload, although its exact function is obscured. The presence of this exploit and embedded script points to a malicious PDF designed for exploitation.

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` `1fcdf208470e230029e8ac32721a55993aba01594c2299529be5064cd1bede68`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3583 bytes
`legacy_pdfkit_stage_000.js` `07ab11a3c73e957a2c8a75d3a058e326e69faa4d0e964dd75bd135ef77a4dc91`	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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