PDF malware analysis — malicious · 8a45708b5ed41e40

MALICIOUS

PDF

47.9 KB Created: k ià036bÃÙñ3=îYÅ-Z»ÍÍ First seen: 2026-05-10

MD5: 77762e3a13649e1aa88a86987fed2137 SHA-1: 51a09cb553e8a876ce36d6304d9200cd56379052 SHA-256: 8a45708b5ed41e40a2f5def24d3402347c003a8fa6f74e8826143436c00b5f38

152 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_ENCRYPTED_WITH_JS heuristic suggests that the JavaScript is used to hide the actual payload, likely for malicious purposes. The embedded URL http://www.cadkas.com is present in the document body and is associated with the PDF editor used, but its reputation is unknown. The script itself is small and obfuscated, but its presence within an encrypted PDF strongly suggests an attempt to deliver a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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.
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.
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.
Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS

PDF declares /Encrypt and also references an executable trigger (/JavaScript). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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.cadkas.com In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0019_000.js`	pdf-javascript-stream	PDF /JS object 19 at offset 0x6886	42 bytes
SHA-256: `76e21958c55cd739dc2b69ddc0b41e5d5cf8ff3ddaccfc6393f1aec9622bde05`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
Preview script First 1,000 lines of the extracted script eval("eval(\""+getField("e").value+"\")");
`javascript_obj0030_000.js`	pdf-javascript-stream	PDF /JS object 30 at offset 0x181E	42 bytes
SHA-256: `f0197cfd71c91e1527a18fee533ce616d5d39ef0414ac04e836c5c0c6f4feac5`
Preview script First 1,000 lines of the extracted script ߄2�o�� c��@x} S�� N+ Rzxr��wW4;

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