PDF malware analysis — malicious · 5f1d2fafab6e5eb7

MALICIOUS

PDF

5.1 KB

MD5: 5809bb678b8c9cb2a5cb3faa29e41146 SHA-1: d6256f3e67bde40814646ddda1d342896f4110f8 SHA-256: 5f1d2fafab6e5eb79d7a51a3307a41d8187ca4350ce6066b653eed4d4844b3c8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that is heavily obfuscated. Heuristics indicate the script uses eval() and String.fromCharCode(), common in exploit delivery. The ML classifier strongly flags this as malicious. The script's purpose is to download and execute a second-stage payload, as indicated by the exploit cluster firing.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0849_000.js` `04a7b4b615ac7ebc8b7ef3654f76be1bcbccb8517f2e606e1f0968a89f9f91cf`	pdf-javascript-stream	PDF /JS object 849 at offset 0x133	8359 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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