Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e81c525ebe0afc7…

MALICIOUS

PDF

2.3 KB
MD5: 3b62427d969dbd59aee0f3da499898e9 SHA-1: f741633dead85cd5d5f5725502220162b73a2f26 SHA-256: 5e81c525ebe0afc77df1e4c6838b922ef8a20255e1af9eb6ecad06bb12da3d85
68 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristics and the presence of a javascript_obj0005_000.js file. The JavaScript code appears to be obfuscated and attempts to construct a URL. The embedded URLs point to www.1freehosting.com, which is likely used as a lure or a potential staging ground for malicious content. The ML classifier strongly flags this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Embedded script payload in PDF stream medium 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.
  • JavaScript action low 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.
  • 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://www.1freehosting.com
    • http://www.1freehosting.com/free-website-and-hosting.html

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0005_000.js
37d6cb1bf9a5892d89b9cd248063d64122e688415234221b42cf99b91e1da7f4		 pdf-javascript-stream PDF /JS object 5 at offset 0x10F 1859 bytes
embedded_pdf_script_000006e1.bin
23a1ec03b0ffe48deec189ede6b35cfcfe7efabae9264ee942f826e76e6c7084		 pdf-embedded-script PDF decompressed stream script payload at offset 0x6E1 944 bytes

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