Malicious PDF — malware analysis report

Static analysis result for SHA-256 394f000f47dbb914…

MALICIOUS

PDF

7.0 KB First seen: 2026-05-10
MD5: 662cbdf4313d1b7192f73aa0b39d2108 SHA-1: 19b076b5bd1348b612c511d12577cb9b77ad65b1 SHA-256: 394f000f47dbb9146ba87fb21d6f5bea7949aee7cd13db3c5f1fd90b015bedcf
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains an embedded JavaScript stream that utilizes the unescape() function, indicating an attempt to obfuscate malicious code. This script is likely designed to exploit a vulnerability within the PDF reader to execute arbitrary code. The presence of JavaScript and the obfuscation technique strongly suggest a malicious intent, likely for delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000327.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 2307 bytes
SHA-256: 612c3cafe13b9a6c7f445967b9aaf68fa11ad4b8f035a7e38434bf057f6372fd
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
objstm_0024_00.bin pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes
SHA-256: 3d58b08f0ad8dfd74d80aa04d1570c55e66bc6faa391245db3239e95cb6d746f

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