PDF malware analysis — malicious · 2e37531643c284a8

MALICIOUS

PDF

4.0 KB

MD5: 0a7d26b6f8e56a677ee9ad81856ba4d9 SHA-1: 21cacd5a84bccc2301f8c9e7eddd2f04d8a60f97 SHA-256: 2e37531643c284a870535507a139e12abe2beda8db15a3b74a75e7a7c1e04bec

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), suggesting it's designed to execute arbitrary code. The presence of deobfuscated JavaScript files like 'acroform_b64_00.js' further supports this. The primary function of the script appears to be downloading and executing a second-stage payload, though the exact URL or execution method is not directly extractable from the provided evidence.

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
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_obj0013_001.js` `8a83667374c2305f743b2eff34775468ac8763e883eda492402ad6672ec32384`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6313 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `5ae633bc9211da660c460e9730a713fda59f260afb6a56f79e4725110a4aee6f`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3581 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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