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But will that stop spambots from harvesting the e-mail addresses in the PDFs
Completely stop that possibility?
No.
Slow them down greatly?
Most assuredly yes!
1) Upon creating your pdf's implement the maximum 128-bit security settings.
2) Instead of naming the pdf's with a name, use a numbering system.
3) Upload the pdf's into a folder which is named for exclusion in your robot's text.
All these tools used together increase the possiblity of what you desire.