Hi Bio Jeong,
you can use Tableau to first export the .pdf file data into a .csv file, manually add the data that was stored in the table title, and then connect to the .csv file instead. For more information, see Export your data to .csv file.
Some details here as well: PDF File
Lénaïc RIÉDINGER, Global Community Engineer Tableau
If you see a Helpful or Correct response, please mark it thanks to the buttons below the targeted post!
Bio Jeong - I've seen the "An error occurred while communicating..." issue when trying to connect with the a PDF whose filename includes characters that Windows doesn't like. In my case, I swapped out a "/" with "-" and it opened. I'm running MacOS where "/" is just fine in a filename. Would be nice if Tableau gave a more helpful error message.
@Lanaic, who is no longer active so I guess @Tableau, the response above is intriguing but I fail to see how exporting to CSV is helpful when Tableau can't open the table in the first place. Am I missing something? My particular error is "The page or range you specified doesn't exist or contain any tables." even though the PDF seems identical to another which works fine. Ideas?