Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73cf194eec95a9e…

MALICIOUS

PDF

16.5 KB Authoring application: Jrkvwejw Qixafpsobpuc First seen: 2026-05-08
MD5: 3cc57658359fbcc76ec49f9b71a81dba SHA-1: 9fa710fa2597c0136a95cb886a08b4e4eee9acde SHA-256: a73cf194eec95a9e366f3b71159333fcc4fcd59547c147acbd33e310b6d04b5c
72 Risk Score

Malware Insights

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

The PDF file contains an embedded script payload and an embedded file, indicating an attempt to deliver a secondary payload. The presence of a suspicious URL further supports this, suggesting the document is designed to trick the user into interacting with malicious content. The embedded script, though obfuscated, appears to be responsible for handling the download and execution of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://www1.topqqfmaster.rr.nu/?4cjyy=WMbX3bbZ59WX5s%2FRnqiqlala197ltqygo6bSmc%2BSo6nHmKjWp6qspqKiqqmeopiZ4NivZpabn9rW0eKuw7q4h%2BPdya9nid2d&quot;;dgEmj= In PDF document text
    • http://www1.topqqfmaster.rr.nu/?4cjyy=WMbX3bbZ59WX5s%2FRnqiqlala197ltqygo6bSmc%2BSo6nHmKjWp6qspqKiqqmeopiZ4NivZpabn9rW0eKuw7q4h%2BPdya9nid2d&quotIn PDF document text
    • http://ns.adobe.com/xdp/In PDF document text
    • http://www.xfa.org/schema/xci/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.5/In PDF document text
    • http://ns.adobe.com/xtd/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • http://ns.adobe.com/xfdf/In PDF document text
    • http://www.xfa.org/schema/xfa-form/2.8/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 0x40 15831 bytes
SHA-256: 5154ebcbc45023c8709855fbf9bbb8c0031e65558baf766ff03ca5f31fef9294
Detection
ClamAV: No threats found
Obfuscation or payload: likely
111 of 207 identifiers look randomly generated (e.g. 'BSo6nHmKjWp6qspqKiqqmeopiZ4NivZpabn9rW0e') — consistent with name-mangling obfuscation. Carved artifact contains 1 long base64-like blob(s).

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