\documentclass{standalone}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}
\usepackage{tikz}
\usepackage{fp}

\definecolor{prune-ps-dark}{RGB}{80, 0, 46}
\definecolor{prune-ps}{RGB}{120, 0, 70}


\setlength{\parindent}{0pt}

\begin{document}
\FPset{\unitlen}{0.4}
\FPset{\leglen}{72}%
\FPset{\extralen}{22}%
\FPset{\strwidth}{10}%
\FPset{\logoangle}{45}%
\FPeval{logoanglecomp}{180-\logoangle}%
\FPeval{logoanglerad}{\logoangle*\FPpi/180}%
\FPcos{\anglecos}{\logoanglerad}%
\FPsin{\anglesin}{\logoanglerad}%
\FPeval{strdiag}{\strwidth/\anglecos}%
\FPeval{legheight}{\leglen*\anglesin}%
\FPeval{extrah}{\extralen*\anglesin}%
\FPeval{extraw}{\extralen*\anglecos}%
\FPeval{xshift}{\unitlen*0.7}%
\FPeval{yshift}{\unitlen*(\legheight+\extrah)}%

\FPeval{namefontsize}{\unitlen*40}
\FPeval{umrfontsize}{\unitlen*30}
%
\begin{tikzpicture}[x=\unitlen mm, y=\unitlen mm]
\draw[prune-ps, fill] (0,0) -- ++(\strdiag,0) -- ++(\logoangle:\extralen) --++(\logoangle:\leglen) -- ++(\logoangle:\leglen)
    -- ++(-\logoangle:\leglen) -- ++(\strdiag,0) -- ++(\logoanglecomp:\leglen)
    -- ++(\logoanglecomp:\strwidth) -- ++(\logoanglecomp:\strwidth)
    -- ++(-\logoanglecomp:\strwidth) -- ++(-\logoanglecomp:\leglen) -- ++(-\logoanglecomp:\leglen) -- ++(-\logoanglecomp:\strwidth) --cycle;

\begin{scope}[xshift=\xshift mm, yshift=\yshift mm]
\draw[prune-ps, fill] (0,0) -- ++(\strdiag,0) -- ++(\logoangle:\leglen)
   -- ++(-\logoangle:\leglen) -- ++(\strdiag,0) -- ++(\logoanglecomp:\leglen)
   -- ++(\logoanglecomp:\strwidth) -- ++(\logoanglecomp:\strwidth)
   -- ++(-\logoanglecomp:\strwidth) -- ++(-\logoanglecomp:\leglen) -- ++(-\logoanglecomp:\strwidth) --cycle;
\end{scope}
\node[
	anchor = south west,
	font=\sffamily\bfseries\fontsize{\namefontsize}{\namefontsize}\selectfont,
	color=prune-ps
] (lmf) at (\leglen,\legheight-\extrah) {Laboratoire Méthodes Formelles} ;
\node[
	anchor = north,
	font=\sffamily\bfseries\fontsize{\umrfontsize}{\umrfontsize}\selectfont,
	color=prune-ps!30!gray
] (umr) at (lmf.south) {UMR 9021} ;
\end{tikzpicture}

\end{document}