Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa735ae351bdcfa…

MALICIOUS

PDF

13.3 KB First seen: 2026-05-08
MD5: 410103b3f4f092f6406ea9631427acdd SHA-1: 984ffdb73e234f3922c9afc31b4a35ae49a03d15 SHA-256: 2aa735ae351bdcfafd9267a406296845beef084caaac31f7642a995aef350200
70 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of malicious intent, including an embedded script payload and an embedded file object. The presence of XFA form elements and embedded URLs, while some are benign, suggests a complex document structure potentially used for exploitation or obfuscation. The embedded script payload is the primary indicator of malicious activity, likely designed to download and execute a secondary payload.

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/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 0xC6 12883 bytes
SHA-256: 83c5f79816a8f75692b18d9e52edfa747e05fc611eac60a83cd6a4946ce4e306

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