Malicious PDF — malware analysis report

Static analysis result for SHA-256 59148940ecde1d32…

MALICIOUS

PDF

49.8 KB
MD5: 202e82d0c020289a7585c46d3048193d SHA-1: 528a3317564485fc135da360842813fee5f9cc8e SHA-256: 59148940ecde1d323d3c79c827f64a288aa068291f6e4c4d3f61149993e2848c
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment T1059.007 Command and Scripting Interpreter: JavaScript

The PDF was flagged by a machine learning classifier as malicious and contains embedded, executable XFA scripts. These scripts are indicative of an attempt to exploit vulnerabilities within the PDF reader. The embedded file further suggests a payload delivery mechanism. While the exact family is unclear, the techniques point towards a common PDF-based exploit delivery.

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.
  • 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.
  • 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 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/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
39324f2104ced64cee1f48dccf89fbb185cc97233ac959300cc2a3269e85fb9c		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 50216 bytes

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