PDF Integrity Analysis

I need a detailed analysis of a PDF document that I suspect has been altered. I believe some text has been removed.

Requirements:
- Compare current version with other versions
- Identify and confirm any alterations
- Report on the nature and extent of changes

Ideal skills and experience:
- Expertise in PDF analysis tools
- Experience with document forensic analysis
- Attention to detail and accuracy
- Ability to provide a clear, comprehensive report