PDF malware analysis — malicious · 96e2a4ecdb412bd4

MALICIOUS

PDF

6.6 KB First seen: 2026-05-11

MD5: 91de05892fc4b6781d0571ab6b48a1c4 SHA-1: c6603570573e9feac718e61960f2477bc70d61ce SHA-256: 96e2a4ecdb412bd4be95f3c6f1ab05b938db84fe7d7a162b2845309e01a7984b

150 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is obfuscated, as suggested by the PDF_UNESCAPE heuristic firing on an unescape() call. This obfuscation, combined with the presence of a long encoded blob and script obfuscation indicators, points towards an attempt to hide malicious code execution. The primary IOC is the use of the unescape() function, which is often abused in PDF exploits. While no specific family is identified, the techniques suggest a downloader or exploit delivery mechanism.

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(/d6H4n3Q1F9v5/g,'%u'));}var RandomVar3 = RandomVar8('d6H4n3Q1F9v554EBd6H4n3Q1F9v5758Bd6H4n3Q1F9v58B3Cd6H4n3Q1F9v53574d6H4n3Q1F9v50378d6H4n3Q1F9v556F5d6H4n3Q1F9v5768Bd6H4n3Q1F9v50320d6H4n3Q1F9v533F5d6H4n3Q1F9v549C9d6H4n3Q1F9v5AD41d6H4n3Q1F9v5DB33d6H4n3Q1F9v50F36d6H4n3Q1F9v514BEd6H4n3Q1F9v53828d6H4n3Q1F9v574F2d6H4n3Q1F9v5C108d6H4n3Q1F9v50DCBd6H4n3Q1F9v5DA03d6H4n3Q1F9v5EB40d6H4n3Q1F9v53BEFd6H4n3Q1F9v575DFd6H4n3Q1F9v55EE7d6H4n3Q1F9v5 …

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_off00000326.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x326	2043 bytes
SHA-256: `fa529305336815bf437b01623051cd50c4cb32abd8551af48f6533d5bac9b9c9`
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: `677723977f1050bf2b3d56a3cf04b237ffef0fd56c5521cbf5773896c0c2c41f`

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