PDF / .TXT malware analysis — malicious · 48672bba5ce64ff3

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 56cfc2306f6312f424548613b0899f6f SHA-1: 1b34fda55076821bb39076fd16468fbaf58ea6b5 SHA-256: 48672bba5ce64ff3acb4c1dca98a96512d0990e32d038f39572d6f183e181996

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 JavaScript stream is further obfuscated, with a high-confidence PDF_EVAL heuristic firing and the use of String.fromCharCode, suggesting the execution of arbitrary code. The deobfuscated JavaScript file 'acroform_b64_00.js' was identified as a suspicious artifact. The primary function of the embedded script appears to be the execution of obfuscated JavaScript, likely to download and execute 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` `73dde373057f79824a6fe7dee44419e0999df6cd1f86e3ae4993a0a86223c4fc`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6341 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` `93a04671c1ad5be208c2bc64290bd5b2f97609dad167e6faab82b07b024aed98`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3601 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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