Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad107b8f19d3c56…

MALICIOUS

PDF

7.9 KB First seen: 2026-05-10
MD5: 06c0f5c5611e19c72ff4c473ba4c221b SHA-1: a3f4809a576cd152fe0b0bc64db31970b64075b0 SHA-256: bad107b8f19d3c560339c49b91651ef756b529f6f63cf161d25ab85c9af45d30
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_FROMCHARCODE. The embedded JavaScript stream, stream_002_off00000328.bin, is likely responsible for executing malicious code. The obfuscation suggests an attempt to evade detection. No specific malware family could be confidently identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9412

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 2732 bytes
SHA-256: 4fc0635909f04336520b4846239a41dfe827b99673954e8caff74dbb6c3bbcbe
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: 989b242c731056d315c5897b5d9cebbb492edff1ee93c98f531d5f8e9c920773

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