PDF malware analysis — malicious · e8f35ba48d53e7d6

MALICIOUS

PDF

92.8 KB

MD5: b0f2b2759bde3359f348775cbfd59346 SHA-1: 3f99284d6af4d2ea9ea32e0e6028b9452194c8c4 SHA-256: e8f35ba48d53e7d62f9c4b2c7914f00f5b943b97470c8bb3725f30ef3e530041

78 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious Link

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 the exploitation of the media.newPlayer vulnerability. The deobfuscated JavaScript, named 'legacy_pdfkit_stage_000.js', appears to be designed to download and execute a secondary payload, as suggested by its structure and the presence of obfuscated strings that likely form URLs or commands. The overall intent is to leverage a known PDF vulnerability to initiate a malicious download chain.

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` `6be372ca44bda5d2572af19f192489bcc262d5ada6c64e9200308d1826d4f4e0`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2578 bytes
`legacy_pdfkit_stage_000.js` `ada8be7fcbbba2749cefe5122fc7e86dce72eb1b6eeddf6c5a324ca92ef02182`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xC2D	2546 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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