Hi:
First of all, make sure you view your PDF at 100% zoom. Sometimes when the PDF zoom is less than 100%, you can have border lines looking thicker or thinner than you expect. That is a function of the zoom mode -- when you print or view at 100%, the lines are normal.
Another thing you can do is try different style templates:
[pre]
ods pdf file='xxx.pdf' style=journal;
... your proc report;
ods pdf close;
[/pre]
Journal is a very nice, crisp black and white style that a lot of my students prefer.
Last, but not least, you can alter the style of the table and the interior table lines:
[pre]
ods listing close;
ods pdf file='yyy.pdf';
proc report data=sashelp.class nowd
style(report)={bordercolor=cxdddddd
borderwidth=1pt
rules=all frame=box};
run;
ods pdf close;
[/pre]
The color "cxdddddd" is a hex color specification for a very light gray. Refer to this documentation site for more info on style attributes and their values:
http://support.sas.com/documentation/cdl/en/odsug/61723/HTML/default/a002972093.htm
cynthia