PDF malware analysis — malicious · 198ef19b071939de

MALICIOUS

PDF

18.4 KB

MD5: 1b622fb8e5d349e1dbd21505afda0a07 SHA-1: 1b68c059981315f3b30a658f695ab8b70fa6db6d SHA-256: 198ef19b071939de6c39022dde1faa6edc253bbddc29991e20f91a0b52eee6b3

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple engines, including ClamAV which identified it as Pdf.Exploit.Dropped-78. It contains embedded JavaScript within an XFA form, a common technique for exploiting PDF vulnerabilities. The script is likely designed to download and execute a secondary payload, as indicated by the ClamAV detection of an extracted artifact (Pdf.Exploit.Agent-36809).

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` `31b45d5f453e2b1f636e32f1c84d374d546e79a4685b49486a368fc948b8685b`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	18125 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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