PDF / .TXT malware analysis — malicious · e6558b41335f54e2

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 8cf328d4aa5d2f32ade9ce1ed2338193 SHA-1: bc4925ea2199459b9c860762baade8e49709fc1d SHA-256: e6558b41335f54e214e4303d7d65a60143f22bed2f17081f4cb255bccc6dfc48

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The `eval()` call and `String.fromCharCode` usage within the decoded JavaScript stream suggest obfuscation and dynamic code execution. The extracted artifacts `acroform_b64_00.js` and `javascript_obj0013_001.js` are likely components of this malicious script, which is designed to download and execute a second-stage payload. The exact nature of the payload could not be determined due to the obfuscation.

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` `ec8423f5865deebabadf40193f0f6703dafd8c66de9e8e8dc6d0f33fa02c6cbf`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6285 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` `ef6c9cc95940b84de9dadd1033a37034443ec7227906af82597b6d4688a58833`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3560 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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