PDF malware analysis — malicious · 92f9a2be05de9e7f

MALICIOUS

PDF

17.6 KB Created: 2010-03-14 17:18:36 Authoring application: NIhTFqKS (via hcUuHGSI)

MD5: 3a1859371aa7d2021de3b02166670e04 SHA-1: 1bb71834f92c121e28c98d923b40ca0aff77c9e7 SHA-256: 92f9a2be05de9e7f7553f19e46ab7859fbe20bab15acdac56863bb86092985b0

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 JavaScript stream utilizes String.fromCharCode and eval() calls, suggesting obfuscation and dynamic code execution. The high-confidence PDF_EVAL firing points to the use of eval(), which is often used to deobfuscate and execute malicious code. The extracted artifact 'javascript_obj0007_000.js' is likely the deobfuscated payload, which is suspected to download and execute a second-stage payload. The confidence is moderate due to the lack of specific IOCs like URLs or hashes within the provided evidence.

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_obj0007_000.js` `a9a24df73274fe17036477ea5f6d2688be120384049ac753383aad41f34d88ca`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23C	16828 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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