1 Correct answer
I have found the answer at least for my system. It is Myriad Pro.
10
Replies
Uwe,
Regarding Adobe Sans MM and Adobe Serif MM there was this discussion from a few years ago.
I want to use adobe sans mm in editing a document
2. Re: I want to use adobe sans mm in editing a document
Adobe Sans MM and Adobe Serif MM are fallback fonts that Acrobat uses whenever a font is not embedded in a pdf.
These fonts are Multiple Master fonts that only exist within Acrobat and are not available at the system level.
According to Dov Isaacs at Adobe, you must have a font actually installed in your system to be able to use it to edit a PDF.
Think of these as virtual fonts that don't actually exist on your computer, so therefore they can't be used to edit a PDF.
You can see them and you can print them, but you cannot access them.
The only exist within Acrobat and only come into play as a default font that Acrobat utilizes whenever the actual font that was used was not embedded.
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4. Re: I want to use adobe sans mm in editing a document
Dov Isaacs 
Aug 30, 2015 1:02 AM
To augment Bo's correct response ...
(1) A document could absolutely not have originally been created using Adobe Sans or Adobe Serif. They are not installed or otherwise available for normal application use. As Bo indicates, they are special substitution fonts used by Acrobat and some other Adobe applications. It you open a PDF file and look at the Fonts panel of Document Properties (Ctrl-D), for a particular font entry, the only place you would see Adobe Sans or Adobe Serif would be as the font listed asActual Font. This is the case in which the creator of the PDF file didn't embed the font and Acrobat has to try to find the font installed on the user's system or use a substitution font. For fonts such as Helvetica, Times, and Courier, Acrobat has the “smarts” to use system fonts Arial, Times New Roman, and Courier New respectively since they generally have identical set widths to the original fonts. Missing ITC Zapf Dingbats are replaces with Adobe Pi, and for anything else using a Western Latin character set, Adobe Sans or Adobe Serif is used depending on whether the original font was a san serif or serif style. These two Multiple Master technology fonts have the capability of matching the set widths of any other Western Latin font.
(2) There are some very limited situations in which Adobe Sans and/or Adobe Serif can end up showing as the font of the text and possibly even embedded in a PDF file. That is the situation in which a PDF with non-embedded fonts and for which the fonts are not installed on the user's system is printed from Acrobat to the Adobe PDF PostScript printer driver instance, a process known as “refrying a PDF file” which is strongly discouraged by Adobe for some fairly obvious reasons. Since the original font cannot be found, Acrobat outputs PostScript using Adobe Sans and/or Adobe Serif in the PostScript stream and feeds that to the Distiller which them embeds those fonts in the refried PDF file.
(3) If you are trying to get the look of Adobe Sans, whether or not you are trying to edit existing text in a PDF file or add text or even create text in a new document, use Myriad Pro. Adobe Sans was based on an early Multiple Master Type 1 version of Myriad. Myriad Pro is the closest font in terms of design and metrics to Adobe Sans. In terms of Adobe Serif, use Minion Pro. Adobe Serif was likewise based on an early Multiple Master version of Minion. Minion Pro is the closest font in terms of design and metrics to Adobe Serif.
- Dov
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