PDF malware analysis — malicious · 8b585f926c791f77

MALICIOUS

PDF

4.1 KB

MD5: deb99cb18e65033fd3665b05cbc5016d SHA-1: 72e9c091feec25a03f333b5d9308044e1174eaad SHA-256: 8b585f926c791f770f5fb48a97f1070da662502de2344c6f3217212d4b4d732b

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly indicates maliciousness. The JavaScript, particularly in 'acroform_b64_00.js', is obfuscated using eval() and String.fromCharCode, suggesting it's designed to download and execute a second-stage payload. The exact payload and delivery mechanism are not fully discernible due to obfuscation, leading to an unknown family classification.

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_obj0013_001.js` `97361894651d0edfec0fb8f62ece701c50dee87d077eae7d5a59a6371075b296`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6377 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `01ef8bab0cf862b82a2cdadb39324b19963d12f657e0a870c3756acb380f8415`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3629 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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