PDF / .TXT malware analysis — malicious · fbb163fd663ce314

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 1df5934c545561fb239e5aeaac1e265b SHA-1: 07cf9d74fcd613c970c5f83e66f9978baef19210 SHA-256: fbb163fd663ce314e7779f061918f9ce43428aa1b6d1924389edf8b09c9f0be0

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 presence of eval() and String.fromCharCode suggests obfuscated JavaScript code designed to execute arbitrary commands. The extracted artifacts 'acroform_b64_00.js' and 'javascript_obj0013_001.js' are likely components of this malicious script, which probably downloads and executes a second-stage payload. The confidence is moderate due to the obfuscated nature of the script, making precise determination of its exact actions difficult without further dynamic analysis.

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` `c1c948ba017c7b93f38fa7e302e38bebff593baf861092b9fbad3c7f2ba1a569`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6253 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` `8bf0b77bfbd84cc8239633686959d3317d19d83c13bfaaaf724f392f1ed14fb7`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3535 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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