PDF malware analysis — malicious · 3f7457be8a2c14a1

MALICIOUS

PDF

18.3 KB

MD5: 9aa838cb30f8f820c9951a39e780ec1f SHA-1: 54a5e27bd0be0651c76a36deb87ed29e7082ba0e SHA-256: 3f7457be8a2c14a1ff4245ed5759ffdc37d1e5712551a9aa73597b82ce7a57de

178 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains an embedded script payload, flagged by multiple heuristics including a critical ClamAV detection. The ML classifier also strongly indicated maliciousness. The embedded script is likely responsible for downloading and executing a second-stage payload, as suggested by the 'Pdf.Exploit.Dropped' and 'Pdf.Exploit.Agent' ClamAV detections. The presence of an embedded URL further supports the delivery mechanism.

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.
Embedded script payload in PDF stream medium 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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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` `ded3757a811d2aa15159c175c396a924cf5ff91dbd3b51e02db2b2f103c21b0b`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	17963 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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