PDF malware analysis — malicious · 37243a680a837f2b

MALICIOUS

PDF

4.0 KB

MD5: 7302b9daa2b86fc739c21dcf67546ce3 SHA-1: 812f7495d85069dfb7983849cf0995987fd2cd8c SHA-256: 37243a680a837f2b23cd45dd6f918a12827e2390bbb16cb7fc0a8d389fcf2cbf

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The deobfuscated JavaScript stream (acroform_b64_00.js) contains eval() calls and String.fromCharCode, suggesting it is designed to download and execute a second-stage payload. The presence of these obfuscated scripts and the high confidence in their malicious intent point to a downloader or dropper functionality.

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` `dab5cd956ff243e69889a9f12a8ecad8ac273f429b10ab23f29ccf9698265073`	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` `e2efac9951820215691efb3a69df0cbe4c36dd761dc92813713216ebd9f96ab3`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3596 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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