Change position of graphics in multicol environment

Question

In a three-column document (using the multicol environment), I am having trouble to position inline graphics. From my understanding, no floating objects can be used in the multicol environment.

I have several blocks of the type (heading + three indented lines), which are accompanied by a picture that is to be flush with the right column boundary. My attempt was to include the picture in the "heading line" and then to shift it vertically using raisebox.

The goal is to center it vertically with respect to this four-line-block.

Unfortunately, my attempt only increases the space between the heading and the three indented lines. Is there a way to declare the picture "above the text" such that it does not disturb the other lines when moving it?

Minimally working example:

\documentclass[11pt,landscape, a4paper]{article}
\usepackage{multicol}
\usepackage[landscape]{geometry}
\usepackage{graphicx}

\pagestyle{empty}
\setcounter{secnumdepth}{0}
\setlength{\parindent}{0pt}
\setlength{\parskip}{0pt plus 0.5ex}
\geometry{top=1cm,left=1cm,right=1cm,bottom=1cm}

\begin{document}

\raggedright
\footnotesize
\begin{multicols*}{3}

\begin{center}
     \Large{\textbf{Multicol Document}} \\
\end{center}
\vspace{5pt}
\section{Introduction}
\vspace{1cm}
Heading as normal text \hfill\makebox[0cm][r]{\raisebox{-\height}{\includegraphics[width=1.4cm]{picture.png}}}

\hspace*{0.5cm}\begin{tiny}{some line asdasdasdasdasdasdasdasd asdasdasda}\end{tiny} \\
\hspace*{0.5cm}\begin{tiny}{some line asdasdasdasdasdasdasdasd asdasdasda}\end{tiny} \\
\hspace*{0.5cm}\begin{tiny}{some line asdasdasdasdasdasdasdasd asdasdasda}\end{tiny}

\end{multicols*}
\end{document}

Answer 1

to clarify your description what you like to have.

edit: from your comment below i conclude that you looking for the following:

(red lines indicate text area border).

\documentclass[11pt,landscape, a4paper]{article}
\usepackage{multicol}
\usepackage[margin=1cm]{geometry}
\usepackage[export,demo]{adjustbox}
\usepackage{tabularx}

\pagestyle{empty}
\setcounter{secnumdepth}{0}
\setlength{\parindent}{0pt}
\setlength{\parskip}{0pt plus 0.5ex}

%---------------- show page layout. don't use in a real document!
\usepackage{showframe}
\renewcommand\ShowFrameLinethickness{0.15pt}
\renewcommand*\ShowFrameColor{\color{red}}
%---------------------------------------------------------------%
\usepackage{lipsum}

\begin{document}

\raggedright
\footnotesize
\begin{multicols*}{3}

\begin{center}
     \Large\textbf{Multicol Document}
\end{center}

\section{Introduction}
\lipsum[1]

\begin{tabular}{m{\dimexpr\linewidth-4\tabcolsep-1.4cm\relax}r @{}}
Heading as normal text

\tiny
some line asdasdasdasdasdasdasdasd asdasdasda

some line asdasdasdasdasdasdasdasd asdasdasda

some line asdasdasdasdasdasdasdasd asdasdasda

some line asdasdasdasdasdasdasdasd asdasdasda

some line asdasdasdasdasdasdasdasd asdasdasda

some line asdasdasdasdasdasdasdasd asdasdasda
    &
\includegraphics[width=1.4cm, valign=c]{picture}
\end{tabular}\medskip
\lipsum
\end{multicols*}
\end{document}