PDF malware analysis — malicious · c696398a02ad1f55

MALICIOUS

PDF

4.0 KB

MD5: d774625cbbe739ab7f6af7a9f4eba43f SHA-1: c2e5bf8f92da53d130ec63402edc9c41b261b513 SHA-256: c696398a02ad1f55af017d72923826a49fddcf58fee67d807de73c68409d71e0

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flagged this PDF as malicious. The JavaScript streams, particularly 'acroform_b64_00.js', appear to be obfuscated and contain eval() calls and String.fromCharCode, suggesting an attempt to hide malicious code execution. This pattern is typical of PDFs used to download and execute further malware. No specific family could be identified due to the obfuscation.

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` `89ba4d110f00a70ce2b013a6036ae73f933166f332be33d0a21b85ac8a977e94`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6349 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` `089427e999f6422fb2e9cf4977c55e4de920844e27bb1adaf7a1b99e1469725e`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3608 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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