Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03fe8c6bd54f63c…

MALICIOUS

PDF

49.8 KB
MD5: 9b5cce065b837b45a12e9267eae74fb9 SHA-1: 29349724e8b129cc4c1288d9bd82bafd2ef57fb3 SHA-256: a03fe8c6bd54f63cd6f11c6be631a4e03a9323de096980a4f00a83078923607a
166 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

This PDF file was flagged as malicious by multiple heuristics, including critical ClamAV detection (Pdf.Exploit.Dropped-93) and a high-confidence ML classifier. The presence of XFA forms with executable scripts (PDF_XFA_SCRIPT) indicates an attempt to exploit vulnerabilities or deliver a payload. The embedded file further supports the payload delivery vector. The exact nature of the dropped payload is not discernible from the provided evidence, but the overall pattern suggests a malicious document designed for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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-93 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-93
  • 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
f0cf59c3de83fa81d951099d4e55061db2d8e742146b8d46cbcf587a877e1a26		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 50225 bytes

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