PDF malware analysis — malicious · d15222fb56880d77

MALICIOUS

PDF

8.1 KB

MD5: bdc510091c5857888768c9bb87aeae3b SHA-1: c7a5a7f7540bf9678b0e222770287747654cabc4 SHA-256: d15222fb56880d776f2048ddcc5bc28d01728fedef1fdd9a97ae3273d3fa5f81

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is heavily obfuscated and utilizes eval() and String.fromCharCode(). This strongly suggests an attempt to hide malicious code execution. The ML classifier also flagged this PDF with high confidence. The primary attack vector appears to be exploiting PDF vulnerabilities to run this script, likely for downloading and executing a secondary 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `0188a63fe8cbddcb33e76d2d6535016f714a5565cc7672d3ad92630563dd7908`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	14364 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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