PDF malware analysis — malicious · 7d7eb21ae7d783bc

MALICIOUS

PDF

26.2 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 8299dafcdba6d7cdb67f91538fec8718 SHA-1: 194e719a09c51572e2ff41e70b9ed9ff610a0574 SHA-256: 7d7eb21ae7d783bc34475a5a9475d0ac1c93f3ab4912daec77782ac4b7e75cef

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File Execution: Malicious JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes `String.fromCharCode` and an `eval()` call, suggesting obfuscation to hide malicious code. The `eval()` call is a high-confidence indicator of malicious intent, likely to download and execute a second-stage payload. The extracted artifact `javascript_obj0001_000.js` is also flagged as suspicious due to script obfuscation. The file's authoring application is also `String.fromCharCode`, further reinforcing the use of JavaScript for obfuscation.

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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `b9df2469cd42252e8f8a9a818a53a48d9497ccfe7ef3ca4b66197ccd5cfd4a88`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	820 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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