Is the fit to rectangle scaling the image up or down? When you scale an image its Effective Resolution changes, and your preset’s Compresion Settings might handle the image differently. The default is to sample down images that have an effective res over 450ppi.
Also try a Save As before you export and see if that makes a difference.
When you scale the image down you are showing more of the image. InDesign removes the cropped data in an image. By showing more image you are embedding more of the photo, making the file larger.
It sounds like the resized (resampled) image is not able to utilize compression as well as the unsized image.
One way to deal with this issue is to resize images in Photoshop, place into Indesign at 100% size. Although there are scripts to automate this process, my opinion is that this would be unnecessary for trying to preserve file size. If image quality was a factor, then I would consider PS resizing.
Just tried this method but the exported PDF remains at 2 MB.
Is there a reason why the resized image is unable to utilise compression as well as the unsized one? I have another page with 10 photos (500 kb each that I also resized down) and the exported PDF is barely 900 KB.
It sounds like there is something about the particular image. Can you share it via your CC account or Dropbox? There is a known issue with Photoshop files accumulating history metadata and passing it to InDesign.
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