PDF / .TXT malware analysis — malicious · 9de53f31cd77b8c0

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 278d909102074d99ca8a2aa6e2090205 SHA-1: a9beae94600ae2dc91ed6848c420d2f870506c42 SHA-256: 9de53f31cd77b8c0ab2f3fd96c882a733835db3bed6ffe65f850a929a048bee1

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 deobfuscated JavaScript stream (acroform_b64_00.js) suggests the script is designed to download and execute a second-stage payload. The presence of eval() and String.fromCharCode() calls points to obfuscation techniques commonly used to hide malicious intent. While the exact payload is not discernible from the static analysis, the overall pattern is consistent with a downloader.

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` `b5312484eaaa0873917307387bfefa746464542ef721c651691370ec63a190c0`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6317 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` `f0485b2122484c2a728c088409978cbf9d98c95fa318766977b116e6acebd8af`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3585 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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