PDF / .TXT malware analysis — malicious · f250de3a8b7c4811

MALICIOUS

PDF / .TXT

4.1 KB

MD5: 47c9bb448f72a5862c903b129ceee634 SHA-1: 917fd07f1fc5656b3f91d849ed2de33720a83a84 SHA-256: f250de3a8b7c4811226551c7b83ff3a2a6bab79621d2a53ad0996fdf82054c57

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE firings, along with the 'Suspicious extracted artifact' finding detailing 'Long encoded blob' and 'Script obfuscation indicators', strongly suggests that the JavaScript is designed to execute obfuscated code. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely responsible for this malicious behavior, potentially downloading and executing a second-stage payload. Due to the obfuscation, the exact nature of the payload cannot be determined with certainty.

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` `8e4a108769eb270a77e0c3cd16faf3935c0e2a837896f44920c8601f800c5714`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6397 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` `8fb472d9b9011331f00ddc5eab48597dc8723c437d5af8b37a6fbff0b399410d`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3644 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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