Any picture can be saved as PDF document, the tricky part is to find at least a viewer with printing capability in order to do so. XnView for example is excellent viewer that supports hundreds of picture formats and ideal choice for this type of conversion. It should support .pict files (old bitmap pictures) well enough and can save them as PDF documents.
Convert Bitmap graphics file format to Adobe Portable document format.
We have found 4 software records in our database eligible for .pict to .pdf file format conversion.
Microsoft Windows software - convert pict to pdf on Windows
A photo and graphics editor from Ability productivity suites
Convert from pict file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned pict to pdf. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert pict to pdf on OS X
A basic document and image viewer in Mac OS X
Multiplatform software - convert pict to pdf on any platform
A popular utility for viewing and converting graphic files
On-line services software - convert pict to pdf on web
An online graphics converter and resizer