PDF malware analysis — malicious · 4afc776fbf7d594f

MALICIOUS

PDF

4.0 KB

MD5: 59b061236bdbf11d464dc4995182a647 SHA-1: 829da1f23a051996b4bd016ea38b2c988f4a27d9 SHA-256: 4afc776fbf7d594fbde42e67f718d6013373f56a0a248ec0489bb9e5a4b7c688

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), suggesting it's designed to execute arbitrary code. The deobfuscated JavaScript file, 'acroform_b64_00.js', is likely responsible for downloading and executing a second-stage payload. The presence of these elements strongly suggests a malicious intent to compromise the user's system.

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` `eb017e5c475d3e4d90b03fb2cdbf958c7d630f82725909ade4602d595b3a0c11`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6333 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` `b34f8efd93cb7c3da5b9dc787a9b71e13ff38466d140a2401d3cc4aeb3cdd2b5`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3597 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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