PDF malware analysis — malicious · 4f12cdc6086584de

MALICIOUS

PDF

2.1 KB

MD5: 4c48b9a53b9847c25a5f3daf767021cc SHA-1: 1b61e9a0f8c79cff6abf5e7683f771792f6fb477 SHA-256: 4f12cdc6086584de6cc55ae5d90f44970d7bf6b072cca2a0c08f085ccdc6b0ac

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, which is heavily obfuscated using `eval()` and `unescape()` calls. The heuristic firings indicate the presence of JavaScript actions and streams within the PDF, including the use of `String.fromCharCode`. The embedded JavaScript file, 'javascript_obj111611_000.js', is also flagged as suspicious due to script obfuscation. The primary function of the script appears to be downloading and executing a second-stage payload, though the exact URL or execution method is obfuscated. This points to a common delivery mechanism for malware.

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_obj111611_000.js` `9864171cc4152f5d3e5671809dd40cebe1cf9319d0b8bfb0abd003cff50482db`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x767	332 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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