User-agent: *
Disallow: /*.jpg$
Disallow: /*.png$
Disallow: /*.gif$
Disallow: /*.pdf$

User-agent: *
Disallow: /images/
Disallow: /sitebuilder/

User-agent: Googlebot-Image
User-agent: Yandex
User-agent: baiduspider
User-agent: psbot
User-agent: dotbot
Disallow: /