PDF malware analysis — malicious · e3997092711d2c56

MALICIOUS

PDF

4.0 KB

MD5: c41cd2fdca9f3929c7d321757ed02977 SHA-1: 6815dedb5c2c6ea5e6ebaeb0568395c954951807 SHA-256: e3997092711d2c563b4eacce0e7c07d06bb1ad905918dbceeb31c98e39c8a1ca

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL heuristic firing suggests that the JavaScript code is being executed using eval(), and the PDF_FROMCHARCODE heuristic points to obfuscation techniques. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely responsible for the malicious activity. The obfuscated nature of the script and the use of eval() strongly suggest it's designed to download and execute a secondary payload, a common technique for malware delivery.

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` `53542304e367f5b9c92fb5ca4500f37bcbdfe3bd24ea63fa39e3cd8285ed5762`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6209 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` `70011cb147474eddfc2c8b563621c35b39a81546607d4f6baafe174694591a42`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3503 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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