PDF malware analysis — malicious · f828c05fcae820fc

MALICIOUS

PDF

14.7 KB

MD5: de2066080ecb6e7e7936f2e24f72d43f SHA-1: 326bff1fcda98260d2b361f676dcf518e721c08e SHA-256: f828c05fcae820fc01a384194fc7a3655410d35b48bae52ef70d075fd1b8c8cd

178 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF exhibits characteristics of malicious intent, including the presence of an XFA form and an embedded script payload. ClamAV detections further confirm its malicious nature, identifying it as Pdf.Exploit.Dropped-78 and Pdf.Exploit.Agent-36809. The embedded script is likely responsible for downloading and executing a second-stage payload, contributing to the overall attack. The embedded URL, while seemingly benign, is noted within the document's structure.

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` `1e5eb1ec4179a02cbbdc4270a902c02e1d3c50bccde5f03db0aaf9b9423f2ee4`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	14299 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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