PDFs can be edited in Illustrator CS6 using the following steps:

  1. Choose File > Edit > Preferences.
  2. In the PDF preferences, select the “Format” tab and set the “Text Format” to “Text.”
  3. In the “Layout” tab, set the “Columns” to 1 and “Rows” to 1.
  4. In the “Text Format” field, set the “Text Type” to “\x00A0\x00B8”.
  5. Click OK to save your preferences.