PDF malware analysis — malicious · 50d5978b5d5b1543

MALICIOUS

PDF

118.8 KB

MD5: 1101bd70ce78291ce90d641ed8780038 SHA-1: d0eef353b6d41fc9392a527d13f0800a99e1598d SHA-256: 50d5978b5d5b1543a508d38832f4a4bf32a1cc4be1783af79c759b9ae2d7b1fd

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1105 Ingress Tool Transfer

The PDF file contains multiple JavaScript streams, with high-confidence heuristics indicating the use of eval() and a large comment-padded eval stager. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggests malicious intent. The embedded JavaScript is heavily obfuscated, but the presence of eval() and fromCharCode calls points to dynamic code execution, likely for downloading and executing a secondary payload. The extracted file names 'javascript_obj0006_000.js' and 'legacy_pdfkit_stage_000.js' further support the presence of JavaScript-based exploits.

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` `69a2d93912dbff2147561b8ad9e6eb16223d665a1366c45968da523de6889caf`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627555 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` `12ca58273cf0c642c0d559402bdf8ea97af5e5f1afd02f92ab42f98b27fcf57e`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 677 long base64-like blob(s).

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