Access to low level rendering

[DrujbanDusman]

I was wondring if there is any way of extracting from a PDF the boilerplate commands that a PDF viewer would have to execute in order to show the user a PDF (like draw line from (x1, y1) to (x2,y2)). I am aware that you can get text content, but I am more curious about getting information about graphics that is not text. To be more precise I am trying to programatically recognize "drawings" that look like check boxes or radio buttons for example (they just look alike they are not actually stored in the AcroForm).
I am not sure yet how from seeing some lines I can know that it looks like something but that's step 2. For now I am just curios if it is possible to get access to these low level commands. Thx in advance