PDF malware analysis — malicious · 8c7c832464edbf71

MALICIOUS

PDF

4.1 KB

MD5: 9dca189c26afb3e7cc74771a295113d1 SHA-1: 0f8303db66fc812796f5058a80e3eb6ac5ba6740 SHA-256: 8c7c832464edbf71066dfe8997cad72b89e74abe30efb033e9ba9212e9427e9c

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1027 Obfuscated Files or Information

The PDF contains embedded JavaScript, which is heavily obfuscated using eval() and String.fromCharCode. The heuristics indicate suspicious script obfuscation and the presence of JavaScript streams. The primary function of the embedded scripts appears to be downloading and executing a second-stage payload, though the exact mechanism is obscured. Due to the obfuscation, the specific family could not be determined.

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` `9c564dfc53b572ab180aecba97411a313314a91d3438f0f03d707cc28745c5d7`	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` `4cdecb221b9c8516976fb8cfd65d1354627612f082f3e0c9f77b84e979d3cb44`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	5614 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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