PDF malware analysis — malicious · 6191529b37f36240

MALICIOUS

PDF

66.8 KB

MD5: 04568181272f446f8b56e237f5f92e80 SHA-1: 9b21562397c30c4a6d18c8e014909ea4a1f1952d SHA-256: 6191529b37f36240aad6fe53bee553ae6d2bdf9e51cc70b456004f22390c0ab5

176 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating an embedded exploit and script payload within the PDF. The embedded JavaScript, though obfuscated, attempts to reconstruct a string and likely download a secondary payload, which is a common technique for initial execution and further infection stages. The presence of XFA forms and embedded files further supports the exploit vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
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 file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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://ns.adobe.com/xdp/
- 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_00000264.bin` `d53d42dce4ceeb0629073570e6ded958314a3170f2260f3102c8296d92c16f79`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x264	68358 bytes
Detection ClamAV: Pdf.Exploit.Agent-6136306-0 Obfuscation or payload: unlikely

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