From findit tool:

Author: tsepez
Project: chromium-pdfium
Changelist: https://pdfium.googlesource.com/pdfium.git/+/e21501d9427539828b5d547b9d20a752d06914aa
Time: Tue Aug 02 13:36:16 2016 -0700
Lines 1218 of file JBig2_Context.cpp which potentially caused crash are changed in this cl (frame #2, "CJBig2_Context::parseGenericRefinementRegion").

Lines 27-51, 57 of file JBig2_Image.cpp which potentially caused crash are changed in this cl (frame #0, "CJBig2_Image::CJBig2_Image").

Lines 23, 29 of file JBig2_GrrdProc.cpp which potentially caused crash are changed in this cl (frame #1, "CJBig2_GRRDProc::decode").
Minimum distance from crash line to modified line: 0. (file: JBig2_Context.cpp, crashed on: 1218, modified: 1218).

Dan, for routing this issue. I'm not going to be looking at it. Thanks.

The following revision refers to this bug:
  https://pdfium.googlesource.com/pdfium.git/+/b1b8668ef12ae4e7fcb5fbf3f01fa623a319a092

commit b1b8668ef12ae4e7fcb5fbf3f01fa623a319a092
Author: dsinclair <dsinclair@chromium.org>
Date: Mon Aug 08 18:10:48 2016

Check if image width or height are zero before proceeding.

If the width of the CJBig2_Image is set to 0 then the stride_pixels will be
zero and when we divide we'll get a floating point exception.

If the width or height are zero then we can exit early without proceeding with
the rest of the constructor.

BUG= chromium:635008 

Review-Url: https://codereview.chromium.org/2222843004

[modify] https://crrev.com/b1b8668ef12ae4e7fcb5fbf3f01fa623a319a092/core/fxcodec/jbig2/JBig2_Image.cpp

Should get picked up on the next PDFium roll.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/66235aa45c0b0dcc0b875e4ade2747cf6b195ee4

commit 66235aa45c0b0dcc0b875e4ade2747cf6b195ee4
Author: ochang <ochang@chromium.org>
Date: Tue Aug 09 02:38:43 2016

Roll PDFium 135b998..b6befb2

https://pdfium.googlesource.com/pdfium.git/+log/135b998..b6befb2

BUG= 635008 ,634716,632622
TBR=thestig@chromium.org

Review-Url: https://codereview.chromium.org/2226163003
Cr-Commit-Position: refs/heads/master@{#410544}

[modify] https://crrev.com/66235aa45c0b0dcc0b875e4ade2747cf6b195ee4/DEPS

ClusterFuzz has detected this issue as fixed in range 410518:410604.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6354926659960832

Fuzzer: attekett_surku_fuzzer
Job Type: linux_asan_chrome_media
Platform Id: linux

Crash Type: Floating-point-exception
Crash Address: 
Crash State:
  CJBig2_Image::CJBig2_Image
  CJBig2_GRRDProc::decode
  CJBig2_Context::parseGenericRefinementRegion
  
Regressed: https://cluster-fuzz.appspot.com/revisions?job=linux_asan_chrome_media&range=409589:409828
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_asan_chrome_media&range=410518:410604

Minimized Testcase (26.30 Kb): https://cluster-fuzz.appspot.com/download/AMIfv95Ek03jei7Q0VSN3Ge6PnWWSIIUHTjroRMrfmgnJb8plwG6Nb3Bd2ZKU3hJlzDyJXiDiQ37Ayh-3fuQU3teuVuR7RnYVi2uyY75IDtNYyqXHUKSoiUlpdpxDvF33PAFGbdcm49kBgZ_X7g71F7zLwywx-g4a4ITx-mHf88ONpls7Zzd6Bg?testcase_id=6354926659960832

See https://dev.chromium.org/Home/chromium-security/bugs/reproducing-clusterfuzz-bugs for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

Removing EditIssue view restrictions from ClusterFuzz filed bugs. If you believe that this issue should still be restricted, please reapply the label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

i am still able to reproduce this on Windows 7 Chrome Version 54.0.2840.99 m

Testcase

https://cluster-fuzz.appspot.com/v2/testcase-detail/4897365150662656