PDF / .TXT malware analysis — malicious · 2f69e3d8ef73ed8a

MALICIOUS

PDF / .TXT

4.1 KB

MD5: c3ab52fa46e0c352c9a2d4e226910a61 SHA-1: 1c043e855a13a9cb7030774f3a44133f8fd823e9 SHA-256: 2f69e3d8ef73ed8a7050abef36ce9d8232b840b7188e1aebc950f2cf88417bb9

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

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. The extracted files `acroform_b64_00.js` and `javascript_obj0013_001.js` are likely part of this malicious script, which is designed to download and execute a second-stage payload. The exact nature of the payload cannot be determined from the provided evidence.

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` `bec4bd4aa1280bd00793b47e373cc06bbc4efac829dd2b3abcb9175ba1eba1c5`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6345 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` `eb8f5bfcd1d2ad96d49695dd97b998fd387392f5d54898436af4581c65f47991`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3605 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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