PDF malware analysis — malicious · e21d5ea68783f0cf

MALICIOUS

PDF

4.0 KB

MD5: 05a7b2c74e8c39b7223ee58c08b59cc7 SHA-1: e643bf4e20cc4a66d7893c662752933246d9956d SHA-256: e21d5ea68783f0cf93cef07dff1d33b3158060dbef232344ccf99b660c05e633

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The `eval()` call and `String.fromCharCode` usage within the decoded stream suggest obfuscated JavaScript code. Two JavaScript artifacts, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', were extracted. The presence of these elements strongly suggests the document is designed to execute malicious code, likely for downloading and executing a secondary payload.

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` `ebbd101a3a1f4810250bea99e3465277481149aa17ad1ade03ce3956562ab3ea`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6341 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` `0d470b2c7218a9937ec9e05e05a3c6eab3eb65e46da3c4c2954972ae6169d5d1`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3601 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).

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