phranque - 1:42 am on Nov 3, 2012 (gmt 0)

you can use the link rel canonical header for pdfs and you can use the canonical cross-domains.

Official Google Webmaster Central Blog: Supporting rel="canonical" HTTP Headers:
http://googlewebmastercentral.blogspot.com/2011/06/supporting-relcanonical-http-headers.html [googlewebmastercentral.blogspot.com]

Official Google Webmaster Central Blog: Handling legitimate cross-domain content duplication:
http://googlewebmastercentral.blogspot.com/2009/12/handling-legitimate-cross-domain.html [googlewebmastercentral.blogspot.com]

[edited by: phranque at 1:43 am (utc) on Nov 3, 2012]