PDF malware analysis — malicious · 9198782379c81097

MALICIOUS

PDF

4.1 KB

MD5: 947689b297d5c74f6b2fbae6884b1e53 SHA-1: 1f9d9c0c31a6c97830cd42ed328a884fa60ded10 SHA-256: 9198782379c81097c07531e8e76431f72129cb89e0dbad7a50eef95c85f79bcd

68 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 'PDF_EVAL' and 'PDF_FROMCHARCODE' heuristics suggest that the JavaScript code is obfuscated and uses dynamic execution. The extracted artifacts 'acroform_b64_00.js' and 'javascript_obj0013_001.js' are likely part of this obfuscated script. The primary function of this script appears to be downloading and executing a secondary payload, which is a common technique for malware delivery.

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` `c79028c8d35a91c51c66f4b95ac373dd57127b05d07a69c9ccd1d936a0281109`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6445 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` `762bd237d5c270b763aa365c1da3a448e998b2e17d82fcc2e7cdbd14148d143e`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3679 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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