adobe photoshop can do that editing...pero...very minor na kasi a PDF is already a "finish" product.
if you don't have adobe photoshop...then you will have to try other options...
editing that will only mean like converting it to a TIFF, BMP or JPEG or any other graphic file format para pede mo ng dagdagan or i-edit. after that you would have to save it back to PDF format (pero it might not be that clear minsan).
Pero kung you are just joining pages/adding pages of PDF format...kaya ito ng adobe photoshop plus a lot of other features..
Dudes, may ganyang software na kayang gawin yan without the need of converting it to other formats as workarounds.
One common scenario kung san ko ginagamit to is pag may mga forms ako na kelangan i fill out tapos downloadable yung form as PDF. Pero minsan, ayoko ng handwriting ko. Tsaka gusto ko may backup ako nung form na na-fill out ko na.
FOXIT PDF Editor will do the job.
Inside this software, eh io-open mo yung PDF file. Tapos dun mo pwede gawin yung pagedit sa mga files. Pwede ka mag add ng text ,mag delete ng mga images and many others, enough para ma edit nyo yung PDF nyo.
Ang problem lng dito sa software na to eh pag nde pa licensed, each time na isi save nyo yung PDF nyo eh mag maliit na footer na may advertisement. Try nyo din para makita nyo yung advantage.
If you don't want to pay anything then go and download the trial version of Adobe Acrobat or Nitro PDF Professional. You can use both for 30 days free.
editing pdf files depends on the original format before it was converted to pdf.. If its a scanned document, dapat mataas ang resolution para ma recognize ang character using OCR ng adobe acrobat pro. it also depends kung anong gusto mong i-edit sa pdf. dapat may fonts installed kadin.
it is also important na alam mo anong program ginamit to convert it to pdf. because not all pdf file can be read by adobe acrobat.. HTH