PDF malware analysis — malicious · f2d26e015765b401

MALICIOUS

PDF

15.1 KB

MD5: f5bbe50598b13b85a4d453ef45aaf78a SHA-1: 2d09ea7f7fc0d5972141af03c36405f61a5844e5 SHA-256: f2d26e015765b401ac455a76066fe1f811a1b6da9e25003016efcd81c795fa86

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly indicates maliciousness. The deobfuscated JavaScript stream, legacy_pdfkit_stage_000.js, is large and exhibits obfuscation, suggesting it is responsible for downloading and executing a second-stage payload. The presence of 'eval()' and 'String.fromCharCode' within the JavaScript stream further supports this. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `b16022cf6d9c3cf15bfd16f4f544022a75f8c10a38907e8cad9235852816db77`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	308 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `0be39620d4258796ba3cea710099e4c6d711c0df8649cf2af9224d7fb3ffb576`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x192E	11963 bytes
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).

Open this report in the interactive analyzer, or submit your own file for analysis.