User-agent: *
Allow: /
Disallow: /wp-admin/
Disallow: /wp-content/
Disallow: /wp-admin/admin-ajax.php
Disallow: /wp-content/*/*/*/*.pdf
Disallow: /wp-content/*/*/*/*/*.pdf
Disallow: /wp-content/*/*/*/*/*/*.pdf

User-agent: Googlebot
Disallow: /wp-content/*/*/*/*.pdf
Disallow: /wp-content/*/*/*/*/*.pdf
Disallow: /wp-content/*/*/*/*/*/*.pdf