Title and keywords by default, like any other document. Other meta data you can specify are Title Subject Author Keywords Comments Template Last-Author Revision Edit-Time Printed Created Saved Pages Words Chars Thumbnail Creator Security Category Target Bytes Lines Paragraphs Slides Notes Hidden-Slides MM-Clips Scale-Crop Heading-Pairs Titles Manager Company Links-Up-To-Date X-Filter-Version
See the output of the command
anytotx -h
For what meta's can be extracted from which file types.