PDF / .TXT malware analysis — malicious · d6ffe05b5636218e

MALICIOUS

PDF / .TXT

1.8 KB

MD5: d73598a2d0f564b90c66831daa98d177 SHA-1: 2ca5a25479a906b4461b151eecad7eae7558e0b6 SHA-256: d6ffe05b5636218e97274b53c066705fe7123996051325d0ff4470d74967572a

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. High-severity firings for PDF_EVAL and PDF_UNESCAPE, along with ML classification and ClamAV detection (Pdf.Exploit.Agent-35930), confirm malicious intent. The JavaScript, particularly the use of eval() and unescape(), suggests it's designed to deobfuscate and execute further malicious code, likely a downloader for a second-stage payload. The extracted file names 'javascript_obj111611_000.js' and 'legacy_pdfkit_stage_000.js' further support the presence of scripting.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Agent-35930 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35930
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `f23e505f155bfa9b9f356fa9fddf8d7fcafcc37fc2df3878e575e72c00c819d4`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x65F	697 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `2bec7d14aef5f3305a6151ace98533896118d14ae9fde35814b20a0840678e10`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2804 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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