PDF malware analysis — malicious · b34f928be052560f

MALICIOUS

PDF

21.4 KB

MD5: 3e1a800947c54525837ebff4a9f3c8c8 SHA-1: 7d3ee78db27a2bef2f64daaa1b0401c0e0e5f384 SHA-256: b34f928be052560fea52afe21093746e932b6feec3479b3955041e982a1d7997

78 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The critical finding is the 'CVE_2009_4324' heuristic, which specifically identifies the use of the media.newPlayer API via annotation aliases to trigger the exploit. The deobfuscated JavaScript, labeled 'legacy_pdfkit_stage_000.js', likely serves as the exploit's second stage, aiming to download and execute further malicious content. The presence of obfuscation indicators in the extracted artifacts further supports a malicious intent.

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` `6796e565a7a59adb9a697a3d6610f5e298bc1be72dfa024a0ab93a6c5dcb889b`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2205 bytes
`legacy_pdfkit_stage_000.js` `630bbd87d4c991442612bbfc5d0e64a58d98100212c3f8e897f80b45684ffd16`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xAB8	1262 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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