In the PDF destination, customized page numbers can be written in TITLE or FOOTNOTE statements with the THISPAGE and LASTPAGE functions. However, if an escape character of @ is defined and LASTPAGE is used, the text appears as

   1 of @

The following code replicates this behavior:

   ods listing close;
   ods pdf file='test.pdf';
   ods escapechar='@';

   proc print data=sashelp.class;
   title 'Page @{thispage} of @{lastpage}';
   run;

   ods pdf close;
   ods listing close;   

This occurs only in the PDF destination. An @ is being used in the code that is run behind the scenes with the LASTPAGE function, and this causes the conflict. The workaround is to choose another character as the ESCAPECHAR.