PDF / .TXT malware analysis — malicious · bd0778a54836e128

MALICIOUS

PDF / .TXT

4.1 KB

MD5: 70b9c4dbee466166e2d0aa13e7e94f22 SHA-1: 47dd74f5df2e9a0a484932c9e9d72eb12e3223ab SHA-256: bd0778a54836e1282e7ce25bef50b1dd23ebe5df06dab1f4c6e1675547f8c1b8

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 JavaScript stream appears to be obfuscated and uses String.fromCharCode, suggesting an attempt to hide malicious functionality. The primary intent seems to be the execution of this JavaScript, likely to download and run a second-stage payload. The extracted artifact names also suggest JavaScript content.

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` `2ad1a363f19083fd7b70d0e8dd28159e3287fe33ee2275ae096d78452f11ca22`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6381 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` `1125968501211c204ec2f239ca098e3d6c2b7eecdd84ad3cf6bef0f505af24ab`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3632 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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