PDF is really a container and can have just about anything inside of it.
https://www.w3.org/2013/04/odw/odw13_submission_52.pdf
PDF with csv attachments is a good compromise but I rarely see that. Usually it is PDF or Excel and the PDF is a nightmare to munge.
Wouldn't that cover PDF, even though it might be deeply inappropriate for it's content? PDF has several ISO standards, and is most definently machine readable.
PDF should also meet the goal as well:
> available to the greatest number of users and for the greatest number of applications
Huge number of PDF clients, such as PDF.js that powers Firefox's reader.
> If such standards are developed and adopted by the Treasurer, they shall be the format that each State department and agency will use to provide existing and future electronic data sets
Knowing how much government uses PDF... It is probably incoming.
But it makes little/no sense for spreadsheet data. Great for graphs and prose, however.