PDF Forensics and digital forensics

Key Responsibilities:
- Analyze PDF files beyond just the meta data and data streams
- Identify the date of creation and the device/system ID it was created on
- Validate the data structure
- Provide a clear explanation or answer to findings on each PDF document

I would like to know the following on the files:

- Date it was created
- Was it tampered with?
- Data structure is ok?
- What is the device/System ID it was created on?


Please provide your rate per file and detail any tools or methodologies you would use for this task.