PDF malware analysis — malicious · 8a57c1de20058bd9

MALICIOUS

PDF

14.7 KB

MD5: a98493324e009f10027d7f09a3005aeb SHA-1: 21e6d6856e4f7f001e566dbbf12133d59a56326e SHA-256: 8a57c1de20058bd91814aa4621c22cf2fb6ab434c5dc7314ae6d5d5a37481f96

178 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains an embedded script payload, as indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic and confirmed by ClamAV detections on the file and an extracted artifact. The ML classifier also strongly flagged this PDF as malicious. The embedded script is likely responsible for downloading and executing a second-stage payload. The presence of an XFA form is noted but does not directly contribute to the attack pattern beyond its potential to host the script.

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` `efdeb2845825526f4b5a5ae6b2723973740ebe67251e3fcc24ed0473dbd09236`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	14336 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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