PDF malware analysis — malicious · 4fdd70f356894da5

MALICIOUS

PDF

16.8 KB

MD5: 57b96d63e1f7ea6aed960bab207ad726 SHA-1: ec93826cb7b26e10fdf31ba427808ef99f8eb2cf SHA-256: 4fdd70f356894da5bea7480cc6ebb2c9887ded498255ac5b54c58fe482ee2e77

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript that utilizes eval() and unescape() functions, indicating an attempt to execute arbitrary code. The heuristic 'CVE_2009_4324' specifically points to the exploitation of a known vulnerability in Adobe Reader via the media.newPlayer API. The JavaScript appears to be a downloader for a second-stage payload, though the exact download URL is heavily obfuscated and could not be fully reconstructed.

Heuristics 5

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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `5aba6d8a21024a90b66fdf60787d207dee69a34b65eea2980a8d227547a05280`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3040 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111712_001.js` `2c64527bca13ad5b77dfa400c6868cf17d2f1f609df7506c94322806ccb0caf6`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xDA4	11132 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111713_002.js` `59145c33ce36c6f6a707dc451b2fffef40b9cffaffc044a99bcb6efbf5fca10e`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3956	2466 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `77e31ee392e03e0109a99a651a1f965cc21f4a579111db265d7fa458cb9d2899`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xDA4	1080 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` `5091795dc7dfd1e269d30a5ab394f1536cab6157b0cb74b7e26a9fdc9129a46f`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3956	165 bytes
`legacy_pdfkit_stage_002.js` `f8c71f6e84aceb9c01e9c53b91ced1b74691e009f6813587998a4b8bdd87a935`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xDA4	1246 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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