PDF malware analysis — malicious · 20ffcc525495f65c

MALICIOUS

PDF

118.7 KB

MD5: a69a7add500fd3f58d146e625d4e80de SHA-1: 3bb82b9c1ae5e5f048048776ad18a7f2d25b1fba SHA-256: 20ffcc525495f65c4ef407f2a7e61823b790984afc23f233899bd4bae8c85f89

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains multiple embedded JavaScript streams, with high-confidence heuristics indicating the use of eval() and a large comment-padded JavaScript eval stager. ClamAV also detected this file as 'Pdf.Exploit.Agent-36086'. The presence of obfuscated JavaScript strongly suggests the intent to download and execute a second-stage payload, a common technique for initial access or further system compromise.

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `7f419f645464e572a52f160f87adde1d3dae488c5bc2c0a2c83161087181ec61`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627228 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` `a886748c5b30bbd78c87e495e0a1bcfbf4b2f89e7cec4091c19744abb0b2cad4`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262136 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 673 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `089719e36f983f8d6e757a256a38fff7bb64bf3f81974f226ed8cd5e1355dd93`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 639 long base64-like blob(s).

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