PDF / .TXT malware analysis — malicious · d20cd90fa09262af

MALICIOUS

PDF / .TXT

4.0 KB

MD5: a50e82e4a3b6837b364c1983754e5755 SHA-1: f0c83f6097119074d36d7b644f3eda0e8e492dce SHA-256: d20cd90fa09262af7e9612b682ea664b22b24008796bdc738474951aad773721

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream includes an eval() call and uses String.fromCharCode(), suggesting obfuscated code execution. This pattern is commonly used to download and execute a second-stage payload. The obfuscation and lack of specific indicators prevent confident family attribution.

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` `b9dec5372d62dba44772519e447766678f2a9079f5434d873dbcd3c7bf895319`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6297 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` `8b462d4a1a7f8b13b3ec2270bd9b9ed3ba21922a6222e07973b505de9820bf4a`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3568 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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