PDF malware analysis — malicious · 3829ccfc7046efcc

MALICIOUS

PDF

4.0 KB

MD5: 3971e7c1397e559e888b0bb0c118c0f3 SHA-1: e6274da904c9f111acf8afe59bfff2d56b06ff0e SHA-256: 3829ccfc7046efcc486afcb4973229d2e63266862c54cf02d5ccabdf04e6e250

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The extracted JavaScript files, 'javascript_obj0013_001.js' and 'acroform_b64_00.js', are suspicious due to obfuscation indicators. The 'PDF_EVAL' and 'PDF_FROMCHARCODE' firings suggest the script is designed to execute arbitrary code. The primary function of the embedded script appears to be the download and execution of a second-stage payload, though the exact mechanism is obfuscated.

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` `5558e102a0aa0b9644375c737df0cab6874a30feaeebc8fab7791a85b96ecbfd`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6269 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` `2250ed8ff3b7df9fdf845be7bc55425f24ca8b73a9361afd5bd6e03659698306`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3547 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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