Hi:
That is not what I observe. When I run your code, in SAS 9.4M5, the PDF file that I get is searchable using the Ctrl+F function in Acrobat Reader:
1) looking for string RS 6 string is found on obs 21

2) looking for string Park Avenue string is found on obs 54

As you can see, in both searches, the string I was looking for was found and the first instance highlighted.
Cynthia