PDF malware analysis — malicious · 37ff17e679df5ceb

MALICIOUS

PDF

14.5 KB

MD5: 58a7243cb86b6c181bee18c0f75f5f10 SHA-1: 76deaf937307e41012dbfe9c08c7396eb059ca52 SHA-256: 37ff17e679df5ceb5d5ac9f8bec6deb890879a8d38b3ce1fc3b61324f86d301e

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious JavaScript T1027 Obfuscated Files or Information

The PDF sample contains multiple high-severity heuristics indicating JavaScript execution, including eval() and unescape() calls within an embedded JS stream. The extracted JavaScript artifacts show significant obfuscation and hex-escape encoding, typical of malware attempting to hide its true functionality. The primary intent appears to be the execution of this obfuscated script, which likely serves to download and execute a further payload.

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)
Suspicious extracted artifact medium 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.
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `93f3fdceb942579280d3f196f445d15453064a5ad968d92ae645d590c8b83fa8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x195	166 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` `1f769a549749b7a03d38049176f4eddcae9484508eaeac0179cf1ddcba17bb1c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x298	19203 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).
`deobfuscated.js` `630df91980f78ac3796888b26f467f2d7c74712c198ccc39d01130bbad87f85a`	deobfuscated-js	PDF JavaScript deobfuscation pass	71823 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 hex-escaped blob(s).

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