Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb3fd9b75964ab7…

MALICIOUS

PDF

6.4 KB First seen: 2026-05-10
MD5: 8eadf9239fb876dbc20f7baacce58598 SHA-1: b8f309388827e2c1e89a92de695c70340e57755d SHA-256: 8cb3fd9b75964ab7d8ec85c51cbe83e03c03ba987bf970973232ae4d9aac5925
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript streams, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an unescape() call and script obfuscation indicators suggests the JavaScript is designed to perform malicious actions, such as exploiting a PDF reader vulnerability or downloading a secondary payload. No specific family could be identified due to the obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
    RandomVar1=unescape(RandomVar1);
  • 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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000325.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x325 684 bytes
SHA-256: dfa2fbbdef061ecb770ea9172798ec7694664f4e5bdb237b9ed074bf11e4243e
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
stream_003_off000005cd.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5CD 407 bytes
SHA-256: 67d2175c4bf86dd0ed933b35f42d4594ee13310f30a8d0be5646f3ce92e2e349

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