PDF malware analysis — malicious · 8409ecb7ab9dd6f8

MALICIOUS

PDF

7.3 KB

MD5: 05f392a5ea35f7bd932ce8523468542a SHA-1: f8b24024fa971390e718f07440c0401e713cfccc SHA-256: 8409ecb7ab9dd6f871ee62b5f9829469f4da8097010363317f8c5f4e248b450e

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings suggest that the JavaScript is obfuscated and uses eval() and String.fromCharCode() to execute code. The ML classifier strongly flags this PDF as malicious. The extracted JavaScript files, 'javascript_obj0004_000.js' and 'stream_002_off00001b14.js', are likely responsible for downloading and executing a second-stage payload, a common technique for initial access.

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` `7bf0948070073f464f3ca2d92ddab55da0e71b87d07359adcb75f8f0b3f2c704`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	300 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_002_off00001b14.js` `7c6cef9a46f6d76cd770e539b933c1547a414008bbf5ca0f6826df1f81331198`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1B14	314 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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