I opened your PDF in Acrobat Pro and the text was editable.
This seems to be a Foxit issue, though as mentioned, you might want to use a TTF font if that's what Foxit needs.
ArialNarrow.ttf is a common replacement IIRC to ISOCP.shx
You have a Table in your images, you can change all or one cell in a table with respect to the font style. Is that what your asking for ? If so post an example table dwg.
Something like this (vla-SetTextStyle Objtable (+ acDataRow) "Arial") in a lisp.
There are several LISP programs around for stripping MTEXT.
Solved: strip mtext formatting - Autodesk Community
Re: StripMText Issue - Autodesk Community
In the MText Editor there is a down arrow on the top right, scroll down to Remove Formatting.