PDF malware analysis — malicious · 15981208af8e8e66

MALICIOUS

PDF

18.4 KB

MD5: a930aeddf782121f051f8e7344196d37 SHA-1: 8fe43633a7cd6c3803954f65594dcdb126ef6648 SHA-256: 15981208af8e8e664dc0528dfee0a4f30d40e2106699e98682f4e4a9c36b2e70

168 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier, indicating it contains an exploit. The embedded script, identified as JavaScript, is likely responsible for downloading and executing a secondary payload, as suggested by the 'Pdf.Exploit.Dropped-78' and 'Pdf.Exploit.Agent-36809' detections. The XFA form structure further supports the presence of executable content.

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` `46fceb38dce4bb378305567a784690ff2fb7fafae01e8ef7446b747b7ba76fa6`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	18140 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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