PDF malware analysis — malicious · 33e38474a23022ef

MALICIOUS

PDF

18.4 KB

MD5: 408b501c799053303f6efd06704a4bf8 SHA-1: 6519586f05f749aac335d2402c1213f1c4e885d2 SHA-256: 33e38474a23022efcba2ff6e2eb0df605030a0cf9a4e5540e6f47024708a4ff2

168 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains an XFA form and an embedded JavaScript payload, as indicated by the PDF_XFA and PDF_EMBEDDED_SCRIPT_PAYLOAD heuristics. ClamAV detections (Pdf.Exploit.Agent-36789 and Pdf.Exploit.Agent-36809) confirm its malicious nature. The embedded script, likely intended to download and execute a second-stage payload, is the primary driver of the attack. The URL found within the document is associated with XFA templates, further supporting this analysis.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Agent-36789 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36789
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_00000325.bin` `c2c2c415d80a2a555023335bbf75ec89eec0f7be7e591efedd31fa88dc2a4ec2`	pdf-embedded-script	PDF raw stream script payload at offset 0x325	18095 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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