TweakPDF allows you to process PDF files in a workflow to make a variety of automated changes. Elements of a PDF that can be changed are:
Info Dictionary entries, including Title, Author, Subject, Mod and Create Dates. New entries can be added.
Viewer preferences such as the default view, magnification and open action.
Page settings including size, cropping and rotation.
Presentation settings: transitions and durations
The workflow is configurable; you can specify a folder to watch, a destination folder, and a disposition for the input file after it is processed. Also, many of the settings can be dynamically controlled through the use of expressions.