PDF malware analysis — malicious · 75e59b623b2aa7df

MALICIOUS

PDF

5.1 KB

MD5: 931e5bc606072e8a5764357cb649d1dc SHA-1: 1c293783281891615081850e3137cd3afdf3380d SHA-256: 75e59b623b2aa7df0fef06eeeabbc14ef92e67eb42297c32d81bcc73478b7bd8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The PDF file contains obfuscated JavaScript that utilizes eval() and String.fromCharCode, indicating an attempt to hide malicious code execution. The ML classifier strongly flagged this PDF as malicious. The script's primary function appears to be deobfuscating and executing further malicious code, likely a second-stage payload, which is a common technique for malware delivery.

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_obj65493_000.js` `ea37904525e6d6c0b0cf77f42dcecd80f406988a730c0b4faaf4d7ae0e3bd54d`	pdf-javascript-stream	PDF /JS object 65493 at offset 0x134	8350 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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