PDF / .TXT malware analysis — malicious · 35054a94ec872e19

MALICIOUS

PDF / .TXT

4.1 KB

MD5: 825dfe051f28de9ac3a6e1b817f662d4 SHA-1: 631299629f4b5b0728008706fbcb2b705cfbf7d3 SHA-256: 35054a94ec872e19311016ee4c29877142bba12c3b0de37c3b4300f9b410cf68

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 JavaScript stream is heavily obfuscated, as evidenced by the PDF_EVAL and PDF_FROMCHARCODE firings and the 'Script obfuscation indicators' in the static triage. The obfuscated JavaScript is likely responsible for downloading and executing a second-stage payload. The presence of multiple obfuscated JavaScript files suggests a multi-stage infection process.

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` `e9232478567a633ede3459c09d0b2c87672b8dab55c853f3ca7ef76523187d95`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6365 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` `326ad3b56a72d455c596cc5d101fae9bb8648aed7ab7e2e55af524037cd2728e`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3619 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).

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