It used to be possible to select text in columns. I am unsure that feature is still available. Without the pdf file being created with the proper tagging information from its creator application, I'm afraid you are in for a lot of pain. The only thing that might help is to repeated crop the columns the different columns on the page and copy from the cropped pages.
For selecting text from column, you can use select tool in column select mode. For this, go to Tools> Select & Zoom > Select Tool. Thereafter, press Alt button and drag to select the desired column. Pressing the Alt button with Select Tool activates its Column Select Mode.
The solution above (from Swati_S) solves the problem. Thank you!
I am going to have to try that on one of my newer versions (not this machine). I thought they had dropped the column select, but apparently just hid it! Thanks.