PDF malware analysis — malicious · 9433fb8b6ced2b90

MALICIOUS

PDF

6.9 KB First seen: 2026-05-10

MD5: 3ae0a092e4f302c4c4072312f379b591 SHA-1: fa7d48b04a6ccd00491e7c1033e59ce01eac7433 SHA-256: 9433fb8b6ced2b9029d846eb44a9996f11574c4ed3d09c49b57e98d7c75664da

150 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings related to PDF and JavaScript. The presence of an unescape() call suggests obfuscation and potential exploitation of vulnerabilities within the PDF reader. While no specific malicious URLs or scripts were directly extracted, the obfuscated nature points towards an attempt to deliver a malicious payload. The document body is unreadable, providing no further context.

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	2624 bytes
SHA-256: `f75c7161b8da479f364c3000a4582dd744bce7b33ecd9c2cc9bc4c7c490eb9da`
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).
`objstm_0024_00.bin`	pdf-objstm-decoded	PDF /ObjStm 24 0 obj (inflated)	331 bytes
SHA-256: `914661ea3e86af77ce3a4a29d52cf0a3d9309f344bf6c0ff7060ddae8f65d9aa`

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