PDF malware analysis — malicious · bb3c353fbbd4ab0b

MALICIOUS

PDF

4.1 KB

MD5: 379d626ba008c625aafe154cfc1baecd SHA-1: a6b0c1b27e9518598223f67e28d1beefb153a2e2 SHA-256: bb3c353fbbd4ab0be4bdcd3d558a6b1bdc1e4f9f694cf58d5c5697c6b7ae1f21

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF document contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream, specifically the one at offset 0x39F, utilizes eval() and String.fromCharCode, suggesting obfuscation and dynamic code execution. The extracted JavaScript files 'acroform_b64_00.js' and 'javascript_obj0013_001.js' are likely responsible for the malicious functionality. The primary intent appears to be downloading and executing a second-stage payload.

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` `7ec6b61a9c02abbd6319b8dacf92376f5d6d80c16c3a417bd1d1f91817b072e1`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6433 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` `ecf671d50e563d3ff95a075e26bed655706026da852993e7541c5f3c064c9abb`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3671 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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