Note:
When submitting data to a URL, it is recommended that you specify an absolute target. Relative targets are interpreted relative to the user environment, which can vary from one user to the next at run time.
This format submits a package containing an embedded PDF file. Choose this format if the form contains a signature field, or if a copy of the form together with its data needs to be saved by LiveCycle Forms ES or submitted to another type of target server. Do not choose this option if the form initiates server-side processing, if LiveCycle Forms ES will be used to render HTML or dynamic forms at run time, or if the form is a PDF form that will be filled in Adobe Reader without the use of LiveCycle Reader Extensions ES.
See also 

To insert a submit button that embeds a PDF