PDF Contents not being rendered and ...

I have a pdf which contents can be seen using adobe or whatever pdf reader but when I try to see it with radaee, contents aren´t being rendered, only the structure but not the fonts.

Also, checkboxes ticks are rendered as "4" instead of ticks

mostly, it happen when no font resources.
or language of texts are not supported for extern font.

Thanks for your answer. The Font is Arial. How can I resolve it?

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confirmed, that has no problems.