parse checkboxes from a pdf in rails

Question

I need to parse checkboxes from a PDF. I'm using docksplit gem of ruby.The problem is that when a pdf is parsed only its text gets parsed and there is no sign of check-box existence.

Here is a screenshot of my PDF checkbox( box marked with cross(X) is checked).

Is there any way I can figure it out weather its checked or unchecked.May be through binary data?