PDF malware analysis — malicious · a77e42fbbc39a4e3

MALICIOUS

PDF

13.3 KB Created: 2010-09-08 04:28:51 Authoring application: hub hay

MD5: 4710efe2f0c06a4c28b78ba0eecae87a SHA-1: 9f3ffc4a3593d83573d27c27ac9027949fbcfc86 SHA-256: a77e42fbbc39a4e3be3b1313287fa1707f955a98153c0d63ee7c7786629cf828

178 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1059.001 Command and Scripting Interpreter: PowerShell

The PDF sample contains critical XFA JavaScript heap-spray exploit code, indicating an attempt to execute arbitrary code. The presence of embedded files and risky executable scripts within XFA forms strongly suggests a malicious intent, likely to download and execute a second-stage payload. The exploit targets a known vulnerability in PDF XFA processing.

Heuristics 7

XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT

PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY

PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0001.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x89D	84 bytes
`embedded_file_obj0013.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x94F	228 bytes
`embedded_file_obj0004.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0xA3F	199 bytes
`embedded_file_obj0011.bin` `edee0c22e7bd1c03fe3cb0704cdf6e2d752d98e6ef69c9a7626de025139c7db5`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0xB30	119 bytes
`embedded_file_obj0019.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0xBE7	77 bytes
`embedded_file_obj0015.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0xC8E	56 bytes
`embedded_file_obj0014.bin` `ab7c35af768872932e1f431167d13c48dbcf2f6fa7fa0acfd517e17e957dee8f`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0xFC8	15025 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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