PDF malware analysis — malicious · 9919bca9f7a11900

MALICIOUS

PDF

9.8 KB

MD5: b10a554895e3112183d75afe7da5c691 SHA-1: 44f27eeede91a608ce94786b26868bbc89ec8067 SHA-256: 9919bca9f7a119000bf8f7b503444f027ffcb59216c44a5f13ace604a2414258

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flags this PDF as malicious. The unescape() call suggests obfuscation within the JavaScript. The primary intent appears to be downloading and executing a second-stage payload, as evidenced by the embedded JavaScript artifact.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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_obj0007_000.js` `14cecb178de1e94dec5177d9b6f45a934f6c7acf0d40c6a45eeaa2d21d4b66c7`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	44946 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 237 eval/decoder/string-building token(s).

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