PDF malware analysis — malicious · ff480ff0b00a6a4f

MALICIOUS

PDF

6.8 KB First seen: 2026-05-10

MD5: 1c59301e3359420da9eee5c1f7b1a80c SHA-1: 046a94caf668374bc0af4f275f2d4df8dc7c2020 SHA-256: ff480ff0b00a6a4f24e5deae8dd82f206f9821435969d559b9995cf153851bb5

150 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF document contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is obfuscated and uses an unescape() function, suggesting an attempt to hide malicious code. While no specific malicious URLs or scripts were directly extracted, the presence of obfuscated JavaScript and the use of unescape() strongly suggest an attempt to execute arbitrary code or exploit a vulnerability within the PDF viewer. The benign URLs present do not detract from this assessment.

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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off00000327.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x327	1465 bytes
SHA-256: `91235a2beac62d7bab0200bdb4bab03329a118db39093efabbdf61b68c161efa`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`stream_003_off00000717.js`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x717	407 bytes
SHA-256: `e014283903f98f941dafe25b3116ee2ca248921822d281f11e788e74aa8d9ab2`

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