PDF malware analysis — malicious · 253faa706fdb982b

MALICIOUS

PDF

118.6 KB

MD5: 4316695b7dd429f1e38d02e2cf05b41e SHA-1: 97732418e8c25ab0dab25f64e058e296255042f1 SHA-256: 253faa706fdb982bbb0d121845a4c157bdbdd8a5dee7f64f340f2b2e397f0da7

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a large comment-padded eval stager. This indicates the script is designed to obfuscate and execute arbitrary code. The ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggests this PDF exploits a vulnerability to deliver a malicious payload. The presence of eval() and fromCharCode functions further supports the conclusion that the script is intended to download and execute a second-stage payload.

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` `80b5a5239c81143a35fbf33eadbd3bb2bbd5918c5bff3c909dbb572308b53078`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626772 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` `aa1c2dbf77e29f0a1310dd2c9a597f01dce728c95690d600a7b3899badf24f67`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 623 long base64-like blob(s).

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