PDF malware analysis — malicious · 4b5a4caaf9553846

MALICIOUS

PDF

18.3 KB

MD5: aa2a3bd937a599e110dff0c0d98a4e5c SHA-1: 4fa83c3ddeed53370c1962b2da12688f1b3f7f38 SHA-256: 4b5a4caaf95538466e484cc08f3304b7af3f312af5aba7b29740163c197f9ab7

178 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF was flagged by multiple high-confidence heuristics, including ML classification and ClamAV detections indicating it is an exploit dropper. The presence of an embedded script payload suggests it is designed to download and execute a secondary stage. The embedded URL is likely part of the exploit chain.

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` `97e17e4d948b1540f472e8460002bfabf00683757b72e15c1ed48cf48c1367bf`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	18024 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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