TexStudio - internal embedded pdf viewer shows different figure than external pdf viewer of the output pdf

I use TexStudio (2.9.4) on a Mac OSX (10.10.3) with TexLive. The problem here is that when I insert figures, that are saved as pdf files, and compile with PDFLaTex, the output figures deviate from the input figures in the internal embedded pdf viewer. Links for figures are here: Teil_A_Helium, Teil_A_Luft. The MWE looks as follows:

\documentclass{scrartcl}
\usepackage{graphicx}
\usepackage{subcaption}

\begin{document}
\begin{figure}[h]
\centering
\begin{subfigure}{.5\textwidth}
\centering
\includegraphics[width=1\textwidth]{Teil_A_Helium.pdf}
\end{subfigure}%
\begin{subfigure}{.5\textwidth}
\centering
\includegraphics[width=1\textwidth]{Teil_A_Luft.pdf}
\end{subfigure}
\caption{}
\end{figure}
\end{document}


The output pdf in the external pdf viewer (Preview) looks like this:

The output pdf in the embedded pdf viewer looks like this:

As you can see the figures are not the same. In the embedded pdf viewer all numbers and the experimentally measured dots are missing. Is there a solution to this problem?

Edit: I could not solve the problem. These are my settings under Editor, maybe someone can see the problem:

• It works right here using TeXlive 2014 on Linux with TeXstudio 2.9.4. – Sigur May 23 '15 at 18:10
• Your pdf figure does not contain the fonts embedded. In my case, Helvetica was substituted by Nimbus Sans. So I guess that the pdf viewer from TeXstudio can not load some fonts. – Sigur May 23 '15 at 18:12
• It's a pity TeXstudio does not substitute fonts automatically. If you might know how to fix the problem, please let me know. What editor do you use? – exhausend May 23 '15 at 18:23
• I use TeXstudio 2.9.4 but on Linux. – Sigur May 23 '15 at 18:26
• it substitutes, otherwise I would have problem to see your document. But in mt case, it works well. – Sigur May 23 '15 at 19:03