Disabling hand touch while in PDF file

I use my Note Pro to write comments on PDF files using the stylus.

The problem is that very often, when I rest the side of my hand on the surface of the screen while I get ready to write with the stylus the Pro will page up or down.

Is there a way to disable page up and down and enable only the stylus while in a PDF file?

That would be really great.

Thank you