Over optimization

Q: I have a question about PDF optimization if you optimize the images added to a PDF for a specific keyphrase such as "IELTS Writing Samples PDF + 1" would this help rank the PDF for the term "IELTS Writing Samples PDF"? 

I assume so. And, what would be the "over-optimization" of these images inside the PDF? Any input would be appreciated.

A: Don’t worry about Over-optimization if your putting on image sites, but in some case would be looking at the other elements on the page that the pdf will reside on and checking those elements that are gonna be on that page and then include your data for final optimization.

So like if they have sidebars etc that are always included with each page you would need to count those into your data to resolve your desired optimization rate/ratio/percent.

Also, regarding over-optimization, there are none, as far as we have been able to find it.