August 11 2015

JavaScript with the attribute “CF-Hash” mysteriously added to a source code

The source code was something like this:

scp SourceFile user@remote.host:

But when I visited the page, it was all munged like this:

scp SourceFile user@remote.host<script cf-hash="f9e31" type="text/javascript">
/* <![CDATA[ */!function(){try{var t="currentScript"in document?document.currentScript:function(){for(var t=document.getElementsByTagName("script"),e=t.length;e--;)if(t[e].getAttribute("cf-hash"))return t[e]}();if(t&&t.previousSibling){var e,r,n,i,c=t.previousSibling,a=c.getAttribute("data-cfemail");if(a){for(e="",r=parseInt(a.substr(0,2),16),n=2;a.length-n;n+=2)i=parseInt(a.substr(n,2),16)^r,e+=String.fromCharCode(i);e=document.createTextNode(e),c.parentNode.replaceChild(e,c)}}}catch(u){}}();/* ]]> */</script>:

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