PDF malware analysis — malicious · 46c766953d04363b

MALICIOUS

PDF

8.2 KB

MD5: a4fcd0001e15ac792db8bc6f291d52bf SHA-1: 4649d92eaae7167161e73dcacbc21a4ed5b035ae SHA-256: 46c766953d04363b72f3e465ff0b3c8ce0ecefa24ede01b5be3f80ecbc858dd4

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flags this PDF as malicious. The JavaScript stream, identified as javascript_obj0007_000.js, was further processed, revealing an unescape() call, suggesting obfuscation. This JavaScript is likely responsible for downloading and executing a second-stage payload, a common technique for initial access.

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` `65a6f70fda73d1c5f02b296c3262d916ed01c53161a4600a644c93371b7e6c14`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	44282 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 213 eval/decoder/string-building token(s).

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