PDF malware analysis — malicious · ca6aa8ad6e26fe20

MALICIOUS

PDF

5.1 KB

MD5: b55d61cc4f05479e6eedd76e50f6daed SHA-1: b5c51a03502ba2f3e547780f6547d24082964e3a SHA-256: ca6aa8ad6e26fe204e4aee3124a6f0820524fc5b55e85874768d14a21ed16ced

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

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() to construct and execute code. This embedded script, named 'javascript_obj7134_000.js', is likely responsible for downloading and executing a second-stage payload, which is a common technique for initial access. The lack of specific indicators for a known family leads to an 'unknown family' classification.

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_obj7134_000.js` `7767831fdf77f04b633377754397366f367a3c9439775c227633b5d4ca0f2dcd`	pdf-javascript-stream	PDF /JS object 7134 at offset 0x138	8375 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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