Aloaha PDF Signator
The Aloaha PDF Signator can sign any existing PDF Document. Aloaha does not require special prepared PDF documents or signature fields. The digital signature of the PDF file will automatically be checked and indicated by the PDF viewer (Acrobat Reader). ... Using PDF Signator you can now open, view and navigate PDF documents directly within PDF Signator. ... PDF Signator allows you sign PDF documents without any need to purchase full Adobe Acrobat® or Adobe Document Server for Reader extensions®.
http://www.aloaha.com/download/aloaha_signator.zip - 6Mb - Download - Screenshot