PDF malware analysis — malicious · cf12e3843e3b2c4f

MALICIOUS

PDF

708 B

MD5: 53552a37d5f6901c48ff28ed9f551303 SHA-1: 727ff5ab349ac3500c09bbf2fc64dfd331069fa7 SHA-256: cf12e3843e3b2c4f5db1383df090932cd4a4d6db662496699c5a77f556c4e85a

106 Risk Score

Malware Insights

MITRE ATT&CK

T1027 Obfuscated Files or Information

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is heavily obfuscated, using eval() and unescape() calls, as flagged by PDF_EVAL and PDF_UNESCAPE. The String.fromCharCode heuristic further suggests obfuscation. While the exact payload is not discernible due to the obfuscation, the presence of these indicators points to an attempt to execute malicious code, likely to download and run a second-stage payload. The extracted artifact name 'javascript_obj111611_000.js' is included as an IOC.

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `92ed9afab1b8c3dfbcc01e71adc08b34b7334625c49db3630f811cd57916136b`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x1B9	340 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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