PDF malware analysis — malicious · e95c8a8e14da3937

MALICIOUS

PDF

4.0 KB

MD5: b5886164a4406ad8ba318da00e4e58e3 SHA-1: ebb638781e6cc59e76b06df453a0de8f5782c2f5 SHA-256: e95c8a8e14da39374a7650c139cb1c7ffafe11866d05e27d24d0ae8e60844b1c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The presence of PDF_EVAL and PDF_FROMCHARCODE suggests the script is likely obfuscated and attempts to execute arbitrary code. The ML classifier strongly flags this PDF as malicious. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are the primary artifacts responsible for the malicious behavior, likely downloading and executing a second-stage payload.

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` `c14033d977097b9bf15f125f9afcfbc888ca63ca304e28c3d8450b747b7e26e8`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6289 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` `ce0b70ab181de4a48b89faf9e08653fc6bc0dfda6ed856ba19d990a8858d5652`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3564 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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