PDF / .TXT malware analysis — malicious · a063c311c82381ff

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 18d99c5790c222d59cf431f04f272942 SHA-1: fab2bfec853f42536959cd0fd5a0804a8fc247fe SHA-256: a063c311c82381ff54828a67cad7af019b11d4027e4ee90e5bbe2baf4857c758

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The deobfuscated JavaScript stream (acroform_b64_00.js) contains an eval() call and String.fromCharCode, suggesting it is designed to execute arbitrary code. This script is likely responsible for downloading and executing a second-stage payload. The presence of obfuscated JavaScript and eval() calls points to a downloader or droppper functionality.

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` `a5ed289561656635caa596c2876b873ad6fd9afb537fde8d0ed4f607a2e633da`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6337 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` `b0c0ede8943bd0b009b544c7f00df98c4647f80019c2fb66b1fc0a1dbe61fd68`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3598 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).

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