PDF malware analysis — malicious · 9c2be73e8b92d000

MALICIOUS

PDF

15.8 KB

MD5: 7540ebd3bc769fdf90e625a4285fe500 SHA-1: c086306218653541c479334ad543fabb81e030b4 SHA-256: 9c2be73e8b92d000c7ae642ea8e9f8264f08708efea84c74f73781fd79543346

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file 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 files, suggest that the script is attempting to obfuscate its actions, likely to download and execute a second-stage payload. The exact nature of the payload could not be determined due to the obfuscation, but the overall pattern is consistent with a malicious downloader.

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_obj0004_000.js` `e0c1c2a477e3ed3368c808a32d682bfb057a9d0281a561607a11aabf05ae1aff`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	310 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `254274f0c721f4306309c4c5d31a2df2c7b9702538d6f0044c860c73c210d7dd`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1A5B	12578 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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