Cid Font F1 F2 F3 F4 ((top)) [SAFE]

The PDF refers to /F1 but the font dictionary or its descendant CID font is missing or corrupted.

When you see , it means: "The font resource named F1, which is a CID-keyed font." cid font f1 f2 f3 f4

Now we arrive at the core of our inquiry: What do F1, F2, F3, and F4 represent in the context of CID fonts? The PDF refers to /F1 but the font