PDF malware analysis — malicious · e633f32c53bd65b8

MALICIOUS

PDF

2.3 KB

MD5: a76711526331e6278556773044ad24b4 SHA-1: 368e711b50ad6c9c69f1581f09f5b3656ea98b30 SHA-256: e633f32c53bd65b83eec3c4ab30c0bc9cf3bac143b3c72624f9113f80cd72810

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristic firings. The JavaScript stream is heavily obfuscated, utilizing eval(), unescape(), and String.fromCharCode() as evidenced by PDF_EVAL, PDF_UNESCAPE, and PDF_FROMCHARCODE firings. The obfuscation suggests an attempt to hide malicious code, likely for downloading and executing a second-stage payload. Two JavaScript files were extracted, named javascript_obj111611_000.js and legacy_pdfkit_stage_000.js, which are the primary IOCs.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `e7d1232c16a6e584ebcad6ed89ed39659361935894de0b1df6aee2e4fe16ce04`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x7EA	478 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `0a3b656636c6e2e643b93a703e2fedd5655a1cab9bfbb8b2f9dd9c5461d8c7d8`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2834 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.