PDF / .TXT malware analysis — malicious · 55ca3dc193e6bec0

MALICIOUS

PDF / .TXT

4.1 KB

MD5: b96ea487ffca91bfe2740227743c2426 SHA-1: 63dc2eb7068080c0a712faba2cbaa76c21556ac5 SHA-256: 55ca3dc193e6bec048b1e18775aff302ea623be056c082804a638016f6b9b954

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, PDF_JS, and PDF_EVAL. The 'acroform_b64_00.js' and 'javascript_obj0013_001.js' artifacts suggest obfuscated JavaScript code was extracted. The presence of eval() and String.fromCharCode() points to dynamic code execution, commonly used to download and execute further malicious content. The confidence is moderate due to the lack of specific URLs or network indicators in the provided evidence.

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` `1a57fb671b793604cd147b0b1231cc92956809d4baec8fdbf0983911a2e03246`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6373 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` `a57ed32d3f500de42ba63c1e32f79f84bc98eba20bc95044f45cd6365381b124`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3627 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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