PDF malware analysis — malicious · 126cdac5f019e0c0

MALICIOUS

PDF

14.7 KB

MD5: c21b0726c985fd6af60bfa71332f1eaf SHA-1: e9b827bb3857ddf6e23ae6eea0195c318e8877c7 SHA-256: 126cdac5f019e0c0b54acae829f45756a802601612eb06e79ce3a61aaee4c19a

168 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by multiple engines, including ClamAV, and a machine learning classifier. It contains an embedded XFA form with JavaScript, which is likely used to exploit a client-side vulnerability for execution. The embedded script is heavily obfuscated, but the presence of XFA and embedded scripts strongly suggests an exploit delivery mechanism.

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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
Embedded script payload in PDF stream low 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.
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` `861a5cde98064356980b000a8abb7bd4cc8aaad4489b1b73bd10dc07f23603b1`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	14332 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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