PDF malware analysis — malicious · 085235fbe82569b4

MALICIOUS

PDF

14.6 KB

MD5: 739a340b8be9a6553bc20c2d088d9884 SHA-1: 1a6f7391de1ff9ce0677938c258909b15c5ce2d2 SHA-256: 085235fbe82569b465a0a7d4c467e37a6a3b50682fb5135fa47821e15d1cb413

168 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is a PDF containing an embedded XFA form and script payload, flagged by multiple heuristics and ClamAV as malicious. The embedded script, identified as JavaScript, likely attempts to download and execute a second-stage payload, as indicated by the ClamAV detection names 'Pdf.Exploit.Dropped-78' and 'Pdf.Exploit.Agent-36809'. The script content is heavily obfuscated and truncated, preventing a more detailed analysis of its specific actions.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
Embedded script payload in PDF stream low 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 URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://www.xfa.org/schema/xfa-template/2.5/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_pdf_script_00000329.bin` `5a2dd357ae9c7770dc1111043e54f259081140b12aa753dfc34007b20fdf60ff`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	14259 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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