Even more condensed:
\documentclass{article}
\makeatletter
\def\vafa#1{\ifcase#1\or ا\or ب\or ح\or ح\or خ\fi}
\l...@alph\vafa
\makeatother
\usepackage{hyperref}
\begin{document}
\tableofcontents
\section{Test}
\newpage
\appendix
\section{Another Test}
\end{document}
It seems that the actual problem is because of the presence of Persian
characters.
--
Best wishes,
Vafa Khalighi
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