PDF malware analysis — malicious · 10b5ae5032bb53d3

MALICIOUS

PDF

14.7 KB

MD5: f17b0d804f4b3cd18cf78ecf9cc873e1 SHA-1: 91def86e0230503fa3940a5db34c6f5beff1e412 SHA-256: 10b5ae5032bb53d3547864672ed2b7973cc06cfe055dd83bd8b586aa362f4b31

168 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF was flagged as malicious by multiple heuristics, including ML classification and ClamAV, indicating it exploits a known vulnerability. The presence of an embedded XFA form and script suggests it's designed to execute arbitrary code, likely downloading and running a secondary payload. The embedded script, though truncated, contains JavaScript constructs consistent with exploit delivery.

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` `9024c048a48677fb948b6bb20a12a14633827e412eaa50c4bc531e4b6bfc8265`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	14283 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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