PDF malware analysis — malicious · 465e953a94f85f3d

MALICIOUS

PDF

4.0 KB

MD5: c2c4c19cccbf9ff2811356b997eccc95 SHA-1: 5930d9c2904b1f2478eebc6f9e014ed29c6dff7f SHA-256: 465e953a94f85f3ddee756876b0d61785f094ea49ed4ea4d4277dfeb9d3a0f28

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

This PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream exhibits obfuscation, including the use of eval() and String.fromCharCode(), as flagged by PDF_EVAL and PDF_FROMCHARCODE. The extracted artifact 'acroform_b64_00.js' is a deobfuscated JavaScript file, suggesting the script's purpose is to download and execute a secondary payload. The obfuscation and the presence of JavaScript point towards a common delivery mechanism for malware.

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` `2fc114de90f7d984e7b89985798e059556e3700d6b5fc6c8eaf5a8ab84db1a65`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6185 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` `305647766fa969c93036293cc679b9375090ef931173f10866ec3c1de1b17c13`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3485 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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