PDF malware analysis — malicious · 771d9aef47e31a0a

MALICIOUS

PDF

32.3 KB

MD5: 1088fde6a8c11d120ab3310375744813 SHA-1: 55b8f68e535e3b903a4dee8879407e8603d01aa9 SHA-256: 771d9aef47e31a0ac70fca1ff991a9445e2b4a0f214f07e9e69ab53500602c8a

180 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of XFA forms with executable scripts and a numeric evaluation stager strongly suggests exploitation for client execution. The embedded URL, while seemingly benign, is part of the XFA structure and could be used in conjunction with the script to download additional malicious content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT

PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
ClamAV: Pdf.Exploit.Dropped-92 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-92
XFA numeric character-table eval stager high PDF_XFA_NUMERIC_EVAL_STAGER

PDF XFA initialize script reads numeric form data from rawValue, maps the values through a short character table, and evals the reconstructed stage. This is an exploit-kit staging technique even when the final decoded layer remains encoded.
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/

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