PDF malware analysis — malicious · 519a312c0aa147b5

MALICIOUS

PDF

4.1 KB

MD5: a3709980b16771047249298c35544231 SHA-1: 202a20268c234285f4043338e223d30b53853fea SHA-256: 519a312c0aa147b55334e54c2e12ab65d5a5225601ab98e0f7763e8d1c86f9d0

68 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 includes an eval() call and uses String.fromCharCode, suggesting obfuscation. The primary intent appears to be the execution of this obfuscated script, likely to download and execute a second-stage payload. The extracted artifacts 'javascript_obj0013_001.js' and 'acroform_b64_00.js' further support the presence of JavaScript code within the PDF.

Heuristics 6

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)
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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` `9afce968aa092cd49b37f3a4891a5ee8730fc272b8c4aa8e5eac3d856491c03d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6329 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` `ce8efcba553eb1e84f712c706bcb6fab091acf73681b96b3e65f73daa3a134d4`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3594 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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