Description:
Scripts that use a suspicious trick of specifying the script code as base64 encoded value of the script's src parameter.
Here's how such scripts may look like:
<script src="data:text/javascript;base64,ZG9jdW1lbnQud3JpdGUodW5lc2NhcGUoJyUz...skipped...3NCUzZScpKTs="></script>
Affecting: Any web site (no specific target).