PDF malware analysis — malicious · 81d692ff88e34dc1

MALICIOUS

PDF

4.1 KB

MD5: ba73a70d84f2ef667c3cb7425671b3d3 SHA-1: db95c724ad877cc85448bc65b1aff2617db8984f SHA-256: 81d692ff88e34dc11e093811f9aa4ca0fa7d42014bb89cf4aa5c5f66684d8de3

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings suggest that the JavaScript is obfuscated and uses eval() to execute code, a common technique for downloading and running secondary payloads. The presence of two JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', further supports this. The overall attack pattern is a malicious PDF dropper.

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` `5e342634b1b3b1daa4f2e15733f007f855613f63fb1363710931b55bf56f6ecc`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6349 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` `2f7a88040de6664b7939753c3d9271e152bea1c6b3249863feb027262b02950e`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3607 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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