Malicious PDF — malware analysis report

Static analysis result for SHA-256 101f55b949f16776…

MALICIOUS

PDF

13.1 KB First seen: 2026-05-09
MD5: ec9200b66f76ecf31cdb365caa697df1 SHA-1: 4255fc97be55002731687f6a87be2ee4de947f4b SHA-256: 101f55b949f16776dc57bc9beb1acd92cb18605df0d402c99e0bdc77146a5e13
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains malformed active content and an embedded script payload, strongly indicating an exploit attempt. The ML classifier assigned a very high probability of maliciousness. The embedded script, though partially obfuscated, appears to be JavaScript designed to download and execute a secondary payload, as suggested by the 'String.fromCharCode' usage and the embedded file artifact.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 info 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/ In PDF document text
    • http://www.xfa.org/schema/xci/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.5/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xD5 12678 bytes
SHA-256: 40e2dbe454e6e997d187dcb070a78b4c820bf4199d9fa520736a96a4f05829dc

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