PDF malware analysis — malicious · 94ca51bf36472a15

MALICIOUS

PDF

4.0 KB

MD5: 0af56cae3567a50d14edd74feafa5547 SHA-1: 2361d80bc4874e5e92a1a470ee462006558d892e SHA-256: 94ca51bf36472a156a538a87ec5a543d760d5e629cc805e19e37e1445d50ce09

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), suggesting it's designed to hide malicious functionality. The deobfuscated JavaScript file 'acroform_b64_00.js' was extracted, and while its exact function is not fully detailed, the presence of obfuscated JavaScript within a PDF strongly implies an attempt to download and execute a secondary payload. The extracted artifacts 'acroform_b64_00.js' and 'javascript_obj0013_001.js' are included as IOCs.

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_obj0013_001.js` `2bf79f7740c20b8da5dda9ef8170b9feb4721b881161b02d2d81663217528152`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6321 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `902bed79df54709a4ba82f4704c9caf6ba2d0996c11966f29923b400238e4dea`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3588 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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