You say it was vector, but the damage looks as if, at some point, it was turned into a raster. Did you originally make it? An SVG can contain raster graphics as well as vector. Either way, how did you turn it from SVG into PDF?
I did open it in Inkscape, and save as .PDF. I would agree with you about the "damage", but once I open .pdf again in Inkscape, it looks sharp and clean again. So, it might be rather some sort of anti-aliasing.
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The basic problem is very simple. Although you make think that you have a vector image, regardless of the content of the original document, the PDF file consists of a single, very low resolution image, 20 pixels by 20 pixels with an effective resolution of 5.248 pixels per inch!!!
To make matters worse, whatever created this PDF file (cairo 1.11.2) set the image interpolation option to on for the image, causing whatever the renderer of the image, if it properly follows the PDF specification, to apply an algorithm to interpolate and smooth the image as it is scaled. (Not all renderers really follow the PDF specification and especially for handling of the image interpolation option for images!)
A copy of the PDF file's report as well as the PDF file itself is attached.
Bottom line is that given how the PDF file was created, the behaviour you are seeing is to be expected. Assuming that your original artwork was indeed SVG vectors, the generated PDF file should have filled polygons, not an image. This you need to take up with the company whose software generates this PDF file.
This is not an issue caused by Acrobat or Adobe or that can be fixed by Adobe. Sorry!
Actually, you are absolutely right! Thank you very much. In the meantime I was checking the content of .SVG file, and the way it was created, and, indeed, this 20x20 matrix, which seemed to be a vectorial, was a 20x20 pixel image, instead of filled squares.
I do apologize for claiming the problem with Adobe Acrobat, and thank you, and all participants of the discussion.