PDF malware analysis — malicious · 31e353a998c42b3e

MALICIOUS

PDF

5.2 KB

MD5: 600024400c01a115d0f87f9c19aec68a SHA-1: f682d71072522e19f20fe58f595319b8ecc8f747 SHA-256: 31e353a998c42b3e6e514bc266a1f9c74e5f72c742522d4ccbb9e35775d7aa53

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings suggest that the JavaScript is obfuscated and uses eval() and String.fromCharCode() for execution. The extracted artifact 'javascript_obj0013_001.js' is likely the malicious script. The script's purpose is to execute arbitrary code, which is a common first step in malware delivery. Due to the obfuscation, the exact payload and further actions are not fully discernible from static analysis alone.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `bb79068b3ea98f216458fdf44dad2fd1edab475f2479c042ef045fea7f55084e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	9276 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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