PDF malware analysis — malicious · 78ec132a79b84d19

MALICIOUS

PDF

14.6 KB

MD5: 6790db7ffc188d6378fd3681e38cbda7 SHA-1: 167eb33f338803f49db68b3a05a1d1b52d1dcc44 SHA-256: 78ec132a79b84d1939df15b3e6d592539b4b67f9a9fdce48a4cacc84d65a124f

168 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains an embedded XFA form and script payload, flagged by multiple heuristics and ClamAV as malicious. The embedded script, identified as JavaScript, is likely responsible for downloading and executing a second-stage payload, as indicated by the 'Pdf.Exploit.Dropped-78' ClamAV detection. The script itself is heavily obfuscated, preventing a detailed analysis of its exact actions, but its presence and the overall detection strongly suggest exploitation for client execution.

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` `1e3643211614a035f08d44118504ab397d6c3b37f1ffcb602131ec3e599c8fed`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	14198 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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