Some e-books sold on internet can be downloaded for the Adobe Digital Editions platform, however with the .acsm file, the user only downloads a ticket for the actual ebook download to Adobe Digital Editions software. In essense, .acsm files are something like authorized links to legally claim the purchased ebook.
As such, it is not possible to convert acsm to pdf, the only thing you can is to load it to the client and download the ebook. After this is done, you can usually find the publication either in PDF or ePUB format in the default Adobe Edition location. If your ebook is only available in ePUB format, you can use any of the epub to pdf conversion options to produce PDF file, however most of the publications for Adobe Digital Editions are DRM protected.Open ACSM file Open PDF file
Electronic book viewer based on Flash, a successor to Adobe eBook Reader
Mac version of Adobe's free e-book viewer and manager