I think there might be a flag for the South Asian Association for Regional Cooperation (SAARC), a regional international organization formed by seven countries: India,Pakistan, Bhutan, the Maldives, Bangladesh, Nepal and Sri Lanka. Take a look at the extreme right of this picture taken at the 12th summit in Islamabad in 2004. It seems to be a white flag with the logo, though details are impossible to make out. I also found the following on their website:
"The Heads of State or Government unanimously accepted the recommendation of the Fourth Meeting of Foreign Ministers on the emblem of SAARC."
The logo or emblem of SAARC can also be seen on one of two Bangladeshi stamps commemorating this organization, SG 567, issued in 1995 in honor of the 10th Anniversary of SAARC.
The flag is somewhat more clearly visible in several photos in a PDF available for download from the SAARC website. The flag is white with the logo in gold. The same PDF contains a vectorial SAARC logo, though a quite terribly rendered one. Heavily cleaned, it yielded the attached the above image.