PDF malware analysis — malicious · 583de719e3d0cadb

MALICIOUS

PDF

21.4 KB

MD5: 18ba5974b58ba4db7af510d251d0766d SHA-1: d6a8f696a11eb15bcd716b2bb585b2eb18241e68 SHA-256: 583de719e3d0cadb4126d86dcd74e72885634a5a609443214999c9c8cae1f6bb

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream, particularly javascript_obj0005_000.js, is heavily obfuscated using String.fromCharCode and eval() calls, as flagged by PDF_FROMCHARCODE and PDF_EVAL. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary function of the obfuscated script appears to be downloading and executing a second-stage payload, though the exact URL or execution method is obscured by the heavy obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 7

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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_obj0005_000.js` `71847584ac9d3bd45c146173a84397b8d76b9c3b044666fb7da00360f25eefd0`	pdf-javascript-stream	PDF /JS object 5 at offset 0x15E	21331 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `666accdd987980b5b3056742b39232931690a2448db768948a2d752ee2f24297`	pdf-javascript-stream	PDF /JS object 5 at offset 0x15E	58 bytes

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