Looks good.
However, the sheet seems to have been saved in PDF 1.5 format (Acrobat 6). Though Acrobat 5 will open PDF 1.5 documents, I've found oddities in doing so: such as graphical anomolies (clearing a field may leave the old text behind in an un-deletable form) and the inability to "Save As".
I recommend you use the "PDF Optimizer" feature in the "Advanced" menu (iirc, since I don't have access to Acrobat 6 here at work) to save the document into PDF 1.4 (Acrobat 5) format. That is assuming you haven't used any Acrobat 6-specific features.
If possible, you may also want to have the ability modifiers auto-calculate from the Ability score fields. Here's the quick code ("ab" = the ability score field):
var i = ab.value - 10
if (i > 0){
event.value = Math.round((i - 1) / 2)}
else{
event.value = Math.round((i / 2) - 0.5)}
