The OpenEdge Hive

I am new to pdf include and new to OEhive. we have a custom module which attaches "invoices" in pdf format and sends it as an email. The problem that we are facing is that for some reason the size of the files increases to 2 - 6 MB even though based on the amount of information that is packaged the pdf file should be far smaller around 100k (as per the users ..).
has anyone faced this problem ..all helpful tips would be appreciated. (I am new to this functionality and am going through the code ...).
if more information is needed - please let me know.

Thanks in Advance !!