PDF malware analysis — malicious · 8e18f7b52cdb58a5

MALICIOUS

PDF

7.3 KB

MD5: a422636b35609134948709a6cadb1348 SHA-1: f7e51c853c49a574ebd71b284e42801a15a9bb51 SHA-256: 8e18f7b52cdb58a53ccd98d5fe20c61971183610743c836a5b15d26c3b5bf7f8

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a high-confidence PDF_EVAL heuristic firing suggests that the JavaScript is being used to execute arbitrary code, likely to download and run a second-stage payload. The ML classifier also strongly flagged this PDF as malicious. No document body text was available for analysis, and the scripts were too obfuscated to reconstruct specific URLs or commands.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `662026df5ab525fa5ca2b851a3d7d22adb8fe113fbd3ae42064d82291da27de4`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	307 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_002_off00001b0a.js` `a0173b949e79b6659558954b63458b678f3dc6371e1c47641194dd687a6db671`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1B0A	308 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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