You can tell AutoCAD to permanently replace Xarab.shx with a font you do have.
One of the biggest misconceptions about Xarab.shx is that it stores text visually. It does not. AutoCAD stores text logically (left-to-right in memory) but displays it right-to-left. Xarab.shx Autocad Font
For example, the word "كتاب" (Book): You can tell AutoCAD to permanently replace Xarab
Xarab.shx contains the glyph definitions that allow AutoCAD to perform this reversal on the fly. This is why copying text from AutoCAD to Notepad often results in reversed gibberish. Restart AutoCAD (if it was running)
Restart AutoCAD (if it was running).
Use the Font