Malicious PDF — malware analysis report

Static analysis result for SHA-256 593ae5cc902143ee…

MALICIOUS

PDF

7.8 KB First seen: 2026-05-11
MD5: c293fce536bd510d0467aa59b59b59fd SHA-1: b10daa78d9449dbaf0fa290014e8fdc40dd45dee SHA-256: 593ae5cc902143ee52139cfa5173040d35d414ebefb278b0e50e7a58389d65b3
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains heuristics indicating embedded JavaScript and obfuscated script content. The presence of `String.fromCharCode` and a decoded stream starting at offset 0xB4B suggests the JavaScript is likely used to download and execute a second-stage payload. No specific family could be identified due to the obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9520

Heuristics 5

  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
    Matched line in script
    while(yoezg--){i=0;while(fzyze[i]<0){if(bpgqh())i=-fzyze[i];else i++;}ywapkr8+=String.fromCharCode(fzyze[i]);}
  • 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. (matched inside decoded stream)
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000328.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x328 2483 bytes
SHA-256: 5f4d76961c15da1a8efb3ca2890450d70f97f1e8880d0c48ef75e8988ccf9e32
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
objstm_0024_00.bin pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes
SHA-256: 447594b85d274e453ce02995d57c75d9fc393b1d99a95510f6ac290ef0a58752

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