PDF malware analysis — malicious · 42850a475294de69

MALICIOUS

PDF

121.3 KB

MD5: c0db58e0307573276fd7c01f3115b546 SHA-1: 40b06491aac1646c7aba68077a5a4278f25da0b6 SHA-256: 42850a475294de69dc73a8d2a7312b55319139dc51fff441e332b1bc08638612

110 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream, identified as javascript_obj0007_000.js, is heavily obfuscated and likely responsible for executing a malicious payload. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it's designed to exploit users through its embedded script.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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` `612901659be3a1e86784e856d6139074676d8b032a5a6329c5b3d2040d9193fc`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	41169 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 210 eval/decoder/string-building token(s).

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