What program was used to create the PDF? If it's an Adobe product, this post should probably be moved to the appropriate forum for help. If it's a non-Adobe product, this post can be moved to the Acrobat forum. Either is likely to give you a better chance at an answer.
Note that the Community Help forum is for help in how to use the Adobe Communities. Product questions should be posted in the associated product community.
Which browser / viewer are you using to open the PDF?
I am using google chrome to view the pdf
Instead of opening the file in a default browser viewer, open it directly in Acrobat Pro or free Acrobat Reader.