Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7bf20fa7189fa9…

MALICIOUS

PDF

13.2 KB First seen: 2026-05-08
MD5: 509f7dd10baedbc3a211a2fa6608f3f2 SHA-1: 428b6ff9ce198aacb97c950eae23ad04adb32576 SHA-256: 1a7bf20fa7189fa91d16531f69c6547bdf445bf0a54915fc34f38251adf5e1a1
70 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution

The PDF file contains an embedded script payload, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic. The DOC BODY contains obfuscated JavaScript that appears to be constructing a string from character codes, likely to decode a malicious URL or command. The presence of XFA forms and embedded files further suggests a complex document designed to evade detection and deliver a secondary payload. The script's intent is to download and execute a second-stage 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/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 12790 bytes
SHA-256: c312f69d5c97ae33a7a2c159dd100fea4dc439b289ee38417419fab9f71ebb72

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