PDF malware analysis — malicious · 31792b9404009971

MALICIOUS

PDF

3.9 KB

MD5: 269e618bff2d31d572f108e532c82ea5 SHA-1: a01eee95885c46ffd9b6b6ef8f75be5737237945 SHA-256: 31792b9404009971732ea75388cc0087e6fca1953f4df724beab0ce55274bf68

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

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 is being executed. This script is likely designed to download and execute a second-stage payload, a common technique for initial access. No specific family could be identified due to the 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. (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` `1e1d0de8284f8b6cd66829cfb748f5cb050047af9541244c5561c7e9583c0616`	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` `f83896fbbacd69b16aa756c77dddfd0e0f21f9e6ba424e5ac18be7c4587c226c`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	5569 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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