PDF malware analysis — malicious · d54f5efe75291d6d

MALICIOUS

PDF

1.9 KB

MD5: 31546ff46f3f03f520060802bdf1d61d SHA-1: 29d8422d7de57666484305262f99d7ee9d055ee3 SHA-256: d54f5efe75291d6dae70fdc0a89762b6e0305997297e48a0d11e9a0ba35d7e33

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript with multiple obfuscation techniques, including eval() and unescape() calls, indicating an attempt to hide malicious code execution. ClamAV detected this file as 'Pdf.Exploit.Agent-35930', and ML classification strongly suggests maliciousness. The primary attack pattern involves exploiting PDF vulnerabilities to run arbitrary code, likely 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 0x670	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` `6aa092ebad3c2fb77d43ddef0471e42dbd9b66c2bc465f34991ba3f9245cbc45`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2828 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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