Exploit:W32/PDF-Payload.Gen is a Generic Detection for Portable Document Format (PDF) files that attempt to exploit vulnerabilities in the popular Adobe Acrobat Reader program.
Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.
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This malware typically arrives as a PDF document sent as a e-mail attachment, usually with a title related to current events or purporting to be some sort of form.
This type of malware may also be identified with the detection 'Exploit.PDF-Payload.Gen' or 'PDF-Payload'. The specific vulnerability targeted by the malicious PDF files varies depending on the specific variant.
If the document is run, successful exploitation results in additional malware executables being dropped/downloaded onto the system. A clean copy of the PDF may also be dropped and opened in Acrobat so as to give the illusion that everything is normal.