The string appears to be a variation of a Google Dork , which is an advanced search query used to identify websites with specific URL structures or potential vulnerabilities. Breakdwon of the Query This specific query uses the following search syntax:

: In some cases, leading to Remote Code Execution (RCE) on the server. Slideshare Prevention Best Practices

: This could refer to an "id" parameter often used in dynamic web pages to identify specific records or content.