PDF malware analysis — malicious · fbd589102b5eae6b

MALICIOUS

PDF

978 B

MD5: 4f1252da7e121b3ec3cf1dd0e2e67eea SHA-1: 79ddc667de78b643d51b35d6569863a3461790c2 SHA-256: fbd589102b5eae6b88c69a667cb75ce9373f547a554d92e8e012dfb2efa75fe5

66 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File Execution: Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream, named 'javascript_obj0006_000.js', uses obfuscation techniques such as unescape() and String.fromCharCode(). This script is designed to execute malicious code, likely downloading and running a second-stage payload. The exact payload and delivery mechanism are not fully discernible due to obfuscation, leading to a moderate confidence score.

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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` `8e703b2a19b51d85b659ed52b4e3ae4fc5c598f1970afc79cff54fe53aaae4ce`	pdf-javascript-stream	PDF /JS object 6 at offset 0x167	360 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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