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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
We have observed the following access violation exception in the latest version of Adobe Acrobat Reader DC for Windows, when opening a malformed PDF file:

--- cut ---
(3fb8.2ac4): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=02c50000 ebx=57694ff0 ecx=00000004 edx=00111111 esi=57695010 edi=0000001b
eip=13b51c4e esp=668dd318 ebp=668dd378 iopl=0         nv up ei pl nz na pe nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00010206
CoolType!CTInit+0x6eec7:
13b51c4e 8906            mov     dword ptr [esi],eax  ds:002b:57695010=????????

0:018> !heap -p -a @esi-20
    address 57694ff0 found in
    _DPH_HEAP_ROOT @ 8e1000
    in busy allocation (  DPH_HEAP_BLOCK:         UserAddr         UserSize -         VirtAddr         VirtSize)
                                53ab2af8:         57694e40              1c0 -         57694000             2000
    66d6a8d0 verifier!AVrfDebugPageHeapAllocate+0x00000240
    77304b26 ntdll!RtlDebugAllocateHeap+0x0000003c
    7725e3e6 ntdll!RtlpAllocateHeap+0x000000f6
    7725cfb7 ntdll!RtlpAllocateHeapInternal+0x000002b7
    7725ccee ntdll!RtlAllocateHeap+0x0000003e
    66e5aa2f vrfcore!VfCoreRtlAllocateHeap+0x0000001f
    74a2f1f6 ucrtbase!_malloc_base+0x00000026
    11e5fcd9 AcroRd32!AcroWinMainSandbox+0x00003ed9
    13ae74d4 CoolType!CTInit+0x0000474d
    13b50e2c CoolType!CTInit+0x0006e0a5
    13b507bf CoolType!CTInit+0x0006da38
    13b50736 CoolType!CTInit+0x0006d9af
    13b506c3 CoolType!CTInit+0x0006d93c
    13b5051c CoolType!CTInit+0x0006d795
    13b50398 CoolType!CTInit+0x0006d611
    13b5032b CoolType!CTInit+0x0006d5a4
    13b50208 CoolType!CTInit+0x0006d481
    13b1b3c0 CoolType!CTInit+0x00038639
    13b0036d CoolType!CTInit+0x0001d5e6
    13b01c20 CoolType!CTInit+0x0001ee99
    13b05eff CoolType!CTInit+0x00023178
    13b0036d CoolType!CTInit+0x0001d5e6
    13b01c20 CoolType!CTInit+0x0001ee99
    13b02229 CoolType!CTInit+0x0001f4a2
    13b05c4d CoolType!CTInit+0x00022ec6
    13b032ba CoolType!CTInit+0x00020533
    13b031b3 CoolType!CTInit+0x0002042c
    13b02ef7 CoolType!CTInit+0x00020170
    13b02d85 CoolType!CTInit+0x0001fffe
    13b0dad7 CoolType!CTInit+0x0002ad50
    13b0d96f CoolType!CTInit+0x0002abe8
    1201f455 AcroRd32!DllCanUnloadNow+0x00176495

0:018> kb
 # ChildEBP RetAddr  Args to Child              
WARNING: Stack unwind information not available. Following frames may be wrong.
00 668dd378 13b45405 13d88404 56842dcc 00000001 CoolType!CTInit+0x6eec7
01 668dd394 13b44548 13d88284 275aacb0 668ddb48 CoolType!CTInit+0x6267e
02 668dd3a4 13b50fa7 668dd3f4 13d90130 668dd3e8 CoolType!CTInit+0x617c1
03 668ddb48 13b507bf 56842dcc 668ddb6c 668ddc08 CoolType!CTInit+0x6e220
04 668ddc00 13b50736 43730ff8 668ddc4c 69db2fa8 CoolType!CTInit+0x6da38
05 668ddc14 13b506c3 56842d70 668ddc4c 69db2fa8 CoolType!CTInit+0x6d9af
06 668ddc28 13b5051c 56842d70 668ddc4c 69db2fa8 CoolType!CTInit+0x6d93c
07 668ddc6c 13b50398 668ddd4c cbb06bb8 668ddd10 CoolType!CTInit+0x6d795
08 668ddc98 13b5032b 668ddd4c cbb06be0 668ddd10 CoolType!CTInit+0x6d611
09 668ddcc0 13b50208 631bcff0 668ddd4c cbb06bd0 CoolType!CTInit+0x6d5a4
0a 668ddcf0 13b1b3c0 631bcff0 668ddd4c cbb069cc CoolType!CTInit+0x6d481
0b 668ddeec 13b0036d 56842d70 668ddf24 cbb06868 CoolType!CTInit+0x38639
0c 668ddf48 13b01c20 13d71918 00000001 00000000 CoolType!CTInit+0x1d5e6
0d 668ddf78 13b05eff 56842d70 13d71918 00000001 CoolType!CTInit+0x1ee99
0e 668ddfb4 13b0036d 56842d70 668ddfec cbb05730 CoolType!CTInit+0x23178
0f 668de010 13b01c20 13d719d0 00000001 00000000 CoolType!CTInit+0x1d5e6
10 668de040 13b02229 56842d70 13d719d0 00000001 CoolType!CTInit+0x1ee99
11 668de074 13b05c4d 13d719d0 58fb2fc8 00000004 CoolType!CTInit+0x1f4a2
12 668de0ac 13b032ba 27594fc0 cbb05290 668de698 CoolType!CTInit+0x22ec6
13 668de5b0 13b031b3 56842d70 27594fc0 668de610 CoolType!CTInit+0x20533
14 668de5e8 13b02ef7 56842d70 27594fc0 668de610 CoolType!CTInit+0x2042c
15 668de62c 13b02d85 668de700 00000000 56842d00 CoolType!CTInit+0x20170
16 668de66c 13b0dad7 668de700 27594fc0 00000000 CoolType!CTInit+0x1fffe
17 668de6c8 13b0d96f 668de700 27594fc0 6e865226 CoolType!CTInit+0x2ad50
18 668de718 1201f455 670f0f08 13d72280 6e865226 CoolType!CTInit+0x2abe8
19 668de73c 1201e4e2 6e865226 00000001 00000000 AcroRd32!DllCanUnloadNow+0x176495
1a 668dfaa4 1201a692 668dfbf0 57586f68 00000005 AcroRd32!DllCanUnloadNow+0x175522
1b 668dfc8c 1201a2fe 668dfca0 5e3fea98 00000000 AcroRd32!DllCanUnloadNow+0x1716d2
1c 668dfce0 1201655c 668dfd70 57586f68 00000000 AcroRd32!DllCanUnloadNow+0x17133e
1d 668dfd98 120093ed 20425f7b 00000000 5e3fea98 AcroRd32!DllCanUnloadNow+0x16d59c
1e 668dfe78 12032848 00000000 00000000 00000000 AcroRd32!DllCanUnloadNow+0x16042d
1f 668dfed0 12032647 00000000 00000000 120320d0 AcroRd32!DllCanUnloadNow+0x189888
20 668dff3c 12031fec 20425e67 12031540 5f050ff8 AcroRd32!DllCanUnloadNow+0x189687
21 668dff64 12031551 15777c58 12031540 668dff88 AcroRd32!DllCanUnloadNow+0x18902c
22 668dff74 73cf8674 5f050ff8 73cf8650 4348ebff AcroRd32!DllCanUnloadNow+0x188591
23 668dff88 77285e17 5f050ff8 c74bea74 00000000 KERNEL32!BaseThreadInitThunk+0x24
24 668dffd0 77285de7 ffffffff 772aad8d 00000000 ntdll!__RtlUserThreadStart+0x2f
25 668dffe0 00000000 12031540 5f050ff8 00000000 ntdll!_RtlUserThreadStart+0x1b
--- cut ---

Notes:

- Reproduces on Adobe Acrobat Reader DC (2019.012.20035) on Windows 10, with and without PageHeap enabled (more cleanly with PageHeap, though).

- The crash occurs immediately after opening the PDF document, and is caused by an attempt to write data outside of an allocated buffer.

- Attached samples: poc1.pdf and poc2.pdf (crashing files), original.pdf (original file). We haven't been able to minimize the testcases as the PoC files are significantly mutated beyond simple bit flips.


Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/47275.zip