PDF malware analysis — malicious · 91a3c2a839b647d5

MALICIOUS

PDF

4.0 KB

MD5: bbbf6d3272880291243753f3b224337d SHA-1: 84c2cd4c9b5a1b5bd41aaf623eb2f36ac853e629 SHA-256: 91a3c2a839b647d539c6ccef186ebd8577f831749b7da08f0736addbdd5ec2ec

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript is obfuscated, as suggested by the 'Script obfuscation indicators' and the use of String.fromCharCode. The primary intent appears to be the execution of this obfuscated JavaScript, likely to download and execute a second-stage payload. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are the main artifacts of interest.

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` `3e7ea62732f7b62e24956473db5c095f0e90787b9997bbb33a553773a2abe1bf`	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` `9e7354bf5d966e03bd46cb5ee5e11c3e288e1902a25cb09a90c7f1e041273634`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3549 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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