PDF malware analysis — malicious · c53d351a4a72c425

MALICIOUS

PDF

18.2 KB

MD5: 0f62c79f15a6be850907695359952e8e SHA-1: 385c43b655d000802c0ba86475523ee46ff244d5 SHA-256: c53d351a4a72c4259232b375865d5065566cc585c40b0bc652c0230282362e6c

178 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious Attachment T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

This PDF file was flagged as malicious by multiple engines, including a critical ClamAV detection (Pdf.Exploit.Dropped-78) and a high ML classifier score. It contains an embedded script payload, a common technique for delivering secondary malware. The embedded URL, while seemingly benign, is present within the document structure, suggesting it may be part of the exploit chain. The presence of XFA form elements further indicates a potentially complex PDF exploit.

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.
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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` `50f3b0a0e41de54c9b169707a6be9b47aabaa7cef06e3edcd400ee1170c97eba`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	17955 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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