PDF malware analysis — malicious · a86ce3ee38e83cae

MALICIOUS

PDF

1.9 KB

MD5: 73bebbbf890aed39e2801b7ffbff6aeb SHA-1: b49f4b9495474a0c4b5e86aed59f0b6aad728067 SHA-256: a86ce3ee38e83caee6a80f63544195119633bb43c3cbf636f66b2521d1e6d94d

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV with the signature Pdf.Exploit.Agent-35930. Static analysis revealed embedded JavaScript, including calls to eval() and unescape(), indicating obfuscated code execution. The ML classifier also assigned a high probability of maliciousness. The presence of JavaScript actions and streams strongly suggests the document is designed to exploit PDF vulnerabilities to run malicious scripts, likely for downloading and executing further stages.

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 0x669	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` `183ae4a01fa6ab88eef0d52e275d97a5363ce249b9f9aebd702d8833645772e7`	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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