Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c5d9d26a34ed60…

MALICIOUS

PDF

13.2 KB First seen: 2026-05-08
MD5: 650d2364a788eff71b2352f360771995 SHA-1: b00aa2ddee6c7bb0af1f7fac10a2e24d49fef039 SHA-256: 62c5d9d26a34ed60014ec2d23a28dc08dc5e43f9c85dd8578d4e04c8c2c63ff8
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 exploitation. The ML classifier assigned a high probability of maliciousness. The embedded script, though partially obfuscated, appears to be JavaScript responsible for downloading and executing a second-stage payload from an external source, as suggested by the string concatenation and 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 12710 bytes
SHA-256: abf2880e12fa9058005f35de90f51fa24368992fb391da5f59b50b3748af26af

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