PDF malware analysis — malicious · 203c1b2875da3546

MALICIOUS

PDF

18.3 KB

MD5: 165ee2caf1e9543bc5f08e98e394693f SHA-1: 48e4a70d50f827f2185fd9b1c61c2c13c953326c SHA-256: 203c1b2875da3546fa3d4ebcc8db20d90250eabf3d70e2f614dd4e748f035b50

178 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file exhibits multiple high-severity heuristic firings, including ML classification and ClamAV detections, strongly indicating malicious intent. The presence of an XFA form and an embedded script payload suggests an exploit is being leveraged. The embedded URL, while not directly actionable, points to the potential delivery mechanism. The embedded script is likely responsible for downloading and executing a second-stage payload, a common technique for PDF-based malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Agent-36789 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36789
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_00000325.bin` `cc897f4daab87028fe94258f9b5f31cc102fb148e981a582340b014171e6e79c`	pdf-embedded-script	PDF raw stream script payload at offset 0x325	18033 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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