PDF malware analysis — malicious · 53b8a733ca528f01

MALICIOUS

PDF

1.9 KB

MD5: 32c8249fab31024faa9072ed4d04b73f SHA-1: fd8f4b89c06a49eb87b51d2086b147c3b60f92c2 SHA-256: 53b8a733ca528f0130d6e28ea31f6bfa5efa008e4900f53e9a270365db3028ae

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The presence of PDF_EVAL and PDF_UNESCAPE suggests the script is obfuscated and uses eval() to execute arbitrary code. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically targeting PDF vulnerabilities to run code. The primary attack pattern involves exploiting these vulnerabilities to execute the embedded JavaScript, which is likely designed to download and execute a secondary payload.

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 0x66D	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` `f2e611e2a6708b4b18b8656bd76177d26484a9a85706bd47e4286cced8327e55`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2822 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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