PDF malware analysis — malicious · 5765b16c47e5e025

MALICIOUS

PDF

2.7 KB

MD5: 77e7fd1eda6b2b33b0b7a8e3830279db SHA-1: f3c675badf5f94ccbc95c5d0973713716ac834ac SHA-256: 5765b16c47e5e025ee12eb18633a9fad6e5dcf12546bb4b737bd881fc4c12d21

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_FROMCHARCODE. The JavaScript streams, named javascript_obj111611_000.js and javascript_obj111612_001.js, are obfuscated and likely responsible for downloading and executing a second-stage payload. The presence of eval() and String.fromCharCode calls further supports this conclusion.

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_obj111611_000.js` `dffbd7de2c9ff9e90a0dda5e7b531b2304cfbeafc7005a6add85a85797c8bc3c`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `c8b45d9f6da7c606d8c3db218f4976316c22317fb4715d731d2d39fac90ad73c`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	3282 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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