PDF malware analysis — malicious · c5f8c1c1c28db963

MALICIOUS

PDF

32.3 KB

MD5: c0489e2de69dedd4457e1201cd03d9fd SHA-1: b2054335fe4094e24b1592298bb0d2febebf29f8 SHA-256: c5f8c1c1c28db9639a9a98a4368492f34ee570aad3bf8b1ec26f0d3c20f040de

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contained embedded, obfuscated JavaScript. The JavaScript stream, identified as 'javascript_obj0009_000.js', is highly suspicious and likely responsible for downloading and executing a second-stage payload. The presence of PDF_JAVASCRIPT and PDF_JS heuristics further supports the malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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_obj0009_000.js` `5ba221f3c336126347647329fc50dd71802f8857fc0cb9dd324aa2d14f176dd9`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD6	26672 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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