PDF malware analysis — malicious · 3ca3d1521060beef

MALICIOUS

PDF

4.1 KB

MD5: 108a4f7b725632f5c20409b030419f46 SHA-1: 162e203c6138d0424d10eae540651c5b6bc24bd6 SHA-256: 3ca3d1521060beef11ad18503725a885c279c74dcb9e6bbc7e993f97e0af72c0

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 JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), suggesting it's designed to hide malicious activity. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely responsible for executing the malicious payload. The obfuscated nature of the script prevents a more detailed analysis of its specific actions, such as payload download or persistence mechanisms.

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` `012551a03d3c3038b83086223379ab5b4a3a6f1890fb617d96652f7a0952ece1`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6397 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` `bcc67b0d98a88d38b88e5885a688566c27dc86aec72b87bbf3a85acef7f44505`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3645 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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