PDF malware analysis — malicious · 4bd5c5078de722d7

MALICIOUS

PDF

18.5 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap

MD5: b072e486adc5ea0e5542fa2358348eb4 SHA-1: 219bc881e13041896f58a98cd964b18e429c82c5 SHA-256: 4bd5c5078de722d7bbd0acf9b6d0333cded80b96d22a371d65525e0950d551d0

166 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter

The PDF file was flagged by multiple high-severity heuristics, including PDF_XFA_SCRIPT and ML_NYX_PDF_MALICIOUS, and detected by ClamAV as Pdf.Exploit.Dropped-81. The presence of embedded script payloads within XFA forms indicates an attempt to execute malicious code upon opening the document, likely to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 5

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.
ClamAV: Pdf.Exploit.Dropped-81 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-81
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

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x2C9	84 bytes
`embedded_file_obj0009.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x37A	228 bytes
`embedded_file_obj0010.bin` `1f819e5fde4dfc28acc75336c967d4ac65ee2333a98d9fd56ad196ff17514fcc`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x46D	1466 bytes
`embedded_file_obj0011.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x7C1	199 bytes
`embedded_file_obj0012.bin` `521c76e0c1684eb8371848e6ed37dfa70dbd33cf2619de25e81a8b56b09b91a2`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x8B3	34350 bytes
`embedded_file_obj0013.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x4375	77 bytes
`embedded_file_obj0014.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x441C	56 bytes

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