- Choose Options > PDF Font from the menu bar, and
you should see a pop-up dialog box analogous to the following example:

All fonts embeded in the PDF document are listed here sorted by Name,
Subtype, Encoding, BaseFont and Embedded. But only TrueType font can
be further previewed and other subtype fonts are greyed
When you highlight a kind of font, the Target field will at once displays
all pages number which contain this kind of embeded font, and based
on this target number you can easily find those fonts in the document.
A kind of TrueType font may contain more than one character inside.
If you want to view more about characters of a font, you can double
click this font, or click the check-box before it, or highlight this
font and click on Preview button. And then you should see a pop-up dialog
box analogous to the following example:

In this dialog box, you can click a character and imput a new letter
to replace it.