PDF malware analysis — malicious · 39220cc3126e36d4

MALICIOUS

PDF

70.6 KB

MD5: 0e5466e26923f9a5ef06d0af0aeed8ba SHA-1: 41a78d08aceceb2dae1ebeb4aab30455b3ae8f7c SHA-256: 39220cc3126e36d496af7d1c692a8307a19f14d9160822655c276bc39267085a

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 itself is obfuscated, as suggested by the EXTRACTED_FILE_STATIC_TRIAGE heuristic, and utilizes eval() and String.fromCharCode() for obfuscation. The primary function of this script appears to be downloading and executing a second-stage payload from an external source, as evidenced by the obfuscated JavaScript content. The specific URL or execution details are not directly extractable due to the obfuscation, but the intent is clear.

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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_obj0006_000.js` `2ef5a3423682d753fcb340d070692c2052b72f23f146bad48060ec3686018e13`	pdf-javascript-stream	PDF /JS object 6 at offset 0x12D	71733 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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