PDF malware analysis — malicious · 8a73edcbc526aecb

MALICIOUS

PDF

3.1 KB

MD5: 3ca78a64e2f49d22846a894b7a51a6c0 SHA-1: 628455e49327a91f56e8d752aa9286f6deb87ece SHA-256: 8a73edcbc526aecb88d856e1369295d462921c627e3321b0fa0c252dd531532d

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an eval() call and String.fromCharCode suggests the script is obfuscated and likely intended to download and execute a second-stage payload. The extracted JavaScript files, javascript_obj0010_001.js and javascript_obj0011_002.js, are the primary artifacts of this malicious behavior. Due to the obfuscation and lack of specific indicators, the family remains unknown.

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_obj0010_001.js` `23f1847b2d132010407d5aa7eb1b2011da9cda6def6ef075a61e887b417efe5c`	pdf-javascript-stream	PDF /JS object 10 at offset 0x1F3	3365 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0011_002.js` `9f9db21f35981a899ff490b680eb9df267a124974761068c2b308a2a7194f552`	pdf-javascript-stream	PDF /JS object 11 at offset 0xA5C	259 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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