How to scrape content from a Drupal Site?
The way I would go about it is:


At .htaccess / nginx.conf level, I'd disable access to site for anyone but my own IP. You know, to be sure.
Directly in database, change email address of user 1 to my own OR restore user table from a backup
Use password restore feature to get admin access
Use whatever module I want to export content (stripping it from any html, js, php if it's there)
Delete site thoroughly from the server
Rebuild it, or restore it from pre-Drupageddon backup
Re-import content.