PDF malware analysis — malicious · b55c6015ee5f8bcf

MALICIOUS

PDF

4.0 KB

MD5: 002166b7f4066b8c504ecd9e95826f11 SHA-1: 870b6b2fdbdba32edea314187fc388323660af05 SHA-256: b55c6015ee5f8bcf76f6b71077215176ce3e61626ccf2c9936f551bfd94da952

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 and PDF_JS. The presence of PDF_EVAL and PDF_FROMCHARCODE suggests the JavaScript is heavily obfuscated and likely executes arbitrary code. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are suspicious due to their size and obfuscation indicators. The primary function of this script appears to be downloading and executing a secondary payload, a common technique for initial access.

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` `6e7fe74ca7eef7eb7ef100e3ee33a9f6b30ee5812e06ccf54102f0adf70c1313`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6381 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` `fb0be93e4f9ffcf0ca69335396482e32d8cc6419f25c8f0c1ec957762d5849f1`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3632 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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