PDF / .TXT malware analysis — malicious · cd41150cdf81b73b

MALICIOUS

PDF / .TXT

4.1 KB

MD5: a88cffa76b3399262e8b03d39e25b5df SHA-1: e3e1d97d30e2723c7ac63d0965e20810ac43fa5f SHA-256: cd41150cdf81b73be053382cfbb2d68209abaced2ac379566c978ca7ad5f0202

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 deobfuscated JavaScript stream, 'acroform_b64_00.js', likely contains code designed to download and execute a secondary payload. The presence of 'eval()' and 'String.fromCharCode' suggests obfuscation techniques were employed to hide the malicious script's true functionality. The extracted file names also point to JavaScript artifacts.

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` `3f078a6b16071b3e36c411c9736f0bf954485c4e4026813c48c924d80daa4471`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6409 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` `6f8fb9c03e195bae47570810f1c1a337349db8da83390ee789464bbfee0c5328`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3653 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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