PDF malware analysis — malicious · 3b73bb070ead8caa

MALICIOUS

PDF

4.0 KB

MD5: 1252359946b39f585e31f5d4cd3d4238 SHA-1: 5fd69b32862b615816e826d2c8b101151b8a221a SHA-256: 3b73bb070ead8caa4c3793e561ccfe23b83e5883e222c8ac65f5bb15413118d8

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings, along with the presence of deobfuscated JavaScript, suggest that the script is heavily obfuscated and likely attempts to download and execute a second-stage payload. The extracted JavaScript filenames also point to script execution. Due to the obfuscation, the exact download URL or execution method could not be determined.

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` `cb1c0a0e6a4c3f7f8e135b4d3a87e9b1d5ca242c773d6cefbfbc834ee957653e`	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` `8ac68e036e9be274973014c2fd694e2c7f2d2afc2a940f26f3cbe6f2c89589fc`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3609 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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