LaTeX.org

you could try pgf/TikZ . I've made this short example for you, compile it with pdflatex:
\documentclass[a4paper,10pt,svgnames]{article}
\usepackage{tikz}
\usetikzlibrary{shadows}
\newcommand{\pbox}[4]{%
\begin{tikzpicture}
\node[#3] {\begin{minipage}[t][#2][t]{#1}%
#4
\end{minipage}};
\end ...

[...] I don't see how my problem is related to a font problem. [...]
That's because your understanding of pslatex is very misleading. What you call "pslatex" is simply the latex compiler. The pslatex package I expected is font related.
Well on my system, latex is a symbolic link to either pslatex ...

It's not really clear to me where the problem is, but I think that using PSNFSS is the better way to get access to postscript fonts. To clarify this issue you should provide some code in the sense of a minimal working example (MWE). Please read carefully the advices on the linked page when creating ...

I have a latex file I can smoothly compil using pslatex. I would like to compil it with pdflatex, however, because the latex file is containing some \pbox sequences, I can't.

Is there a way to make pdflatex understand the \pbox sequences ? Or maybe I can replace the \pbox sequences by a pdflatex ...