PDF malware analysis — malicious · fc0116acfba096b8

MALICIOUS

PDF

2.0 KB

MD5: a1fd380c9bd65a8d6e684a681d6407e2 SHA-1: cc3dbe16703f50fe791b4a505686ff1a878a39a3 SHA-256: fc0116acfba096b86d36415e1aaeacd3b97937a4ea275f0d90ea9ed5a50fce59

106 Risk Score

Malware Insights

MITRE ATT&CK

T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, which is heavily obfuscated using `eval()` and `unescape()` functions, along with `String.fromCharCode`. This obfuscated script, extracted as 'javascript_obj111611_000.js', strongly suggests an attempt to download and execute a secondary payload. The high heuristic scores for `PDF_EVAL` and `PDF_UNESCAPE` further support this conclusion. Due to the heavy obfuscation, the exact nature of the payload cannot be determined, hence the family is listed as unknown.

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 0x6FA	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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