How to save a file with a header different from %PDF-1.4?
By default, all documents saved using the full-save mode will have %PDF-1.4 as a header. You may want to use a different header in order to save the file in an older PDF version or as other document formats such as FDF, PJTF, etc. To select a new header, select ‘Customize’ in the ‘Options’ menu. Then enter the new value within the ‘Save Options’ tab. Note that any header should start with the comment character, %.
