PDF malware analysis — malicious · 687298e725358e75

MALICIOUS

PDF

14.8 KB

MD5: 3865cb46386e664cb14559c86aab251d SHA-1: 5a83f8decba44c0a85eed1b8fd72492437652cf1 SHA-256: 687298e725358e75d0aca4312594d43decb7b09412b227e72d612183bcab7c38

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 a script payload, flagged by multiple heuristics and ClamAV as malicious. The embedded script, identified as JavaScript, likely attempts to exploit a client execution vulnerability to download and run a secondary payload, as indicated by the ClamAV detection on an extracted artifact. The specific nature of the exploit and payload is not fully discernible due to script truncation, but the overall pattern suggests a downloader or dropper.

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` `3ac585e25f495ee44dc6929ff3a4bcdf9ad8dfd98b3a982fd2152f231cc203ff`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	14384 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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