PDF malware analysis — malicious · 4ada694be6bc79a5

MALICIOUS

PDF

118.6 KB

MD5: 45cf53f5bc1f0f1ee744df147f6758a8 SHA-1: f16dd0ab1e8144222c58a2f2525b4f922b235666 SHA-256: 4ada694be6bc79a5b25b97936e94c4514f8b1f7f10df1b96a1cafa21b3d65667

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link T1566.002 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV (Pdf.Exploit.Agent-36086). Static analysis revealed multiple JavaScript-related heuristics, including eval() calls and String.fromCharCode usage, indicating obfuscated code execution. A large, comment-padded JavaScript eval stager was also detected. These indicators suggest the PDF is designed to exploit vulnerabilities and download further malicious content.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj0006_000.js` `7cc346262d96fba0508f0095ac37018219b5f47333e16437292a3299cd8e4597`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627553 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `599648726c499d2daadb621d75382023c0f4944dd5cf45324cb3b1033f5a3c7d`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 648 long base64-like blob(s).

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