PDF malware analysis — malicious · 4c9870efbaa080a7

MALICIOUS

PDF

8.1 KB

MD5: 13ee22def1973178767d90d26181879e SHA-1: cb83093732e3f5af2f623af01e1f5c35a8aca67d SHA-256: 4c9870efbaa080a7c2c7b03d99f91698e7f89ae7168abfc40f84a1f23be1f47a

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flags this PDF as malicious. The unescape() function is used, suggesting obfuscation of the JavaScript payload. The embedded JavaScript file, 'javascript_obj0007_000.js', is the primary artifact for further analysis, likely containing exploit code or a downloader.

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` `2ed542fee02b6b43cb5d5445d6a42f8b8a30e9e600a098f1bd3716cd578cdb49`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	40848 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 209 eval/decoder/string-building token(s).

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