PDFtk Server

PDFtk Server can:

Merge PDF Documents or Collate PDF Page Scans
Split PDF Pages into a New Document
Rotate PDF Documents or Pages
Decrypt Input as Necessary (Password Required)
Encrypt Output as Desired
Fill PDF Forms with X/FDF Data and/or Flatten Forms
Generate FDF Data Stencils from PDF Forms
Apply a Background Watermark or a Foreground Stamp
Report PDF Metrics, Bookmarks and Metadata
Add/Update PDF Bookmarks or Metadata
Attach Files to PDF Pages or the PDF Document
Unpack PDF Attachments
Burst a PDF Document into Single Pages
Uncompress and Re-Compress Page Streams
Repair Corrupted PDF (Where Possible)
PDFtk Server does not require Adobe Acrobat or Reader, and it runs on Windows, Mac OS X and Linux.

Reference:

https://www.pdflabs.com/tools/pdftk-server/