PDF malware analysis — malicious · ff0fc51852b1dd13

MALICIOUS

PDF

8.0 KB

MD5: 753b5f499a9ba25819bcddd07b55e4b0 SHA-1: 931a66b1107645abad464364625185bb3e9dddd1 SHA-256: ff0fc51852b1dd133ca143e8a065137d54b2d351fdee314bbf4443ad4cc52a91

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. High-confidence firings for PDF_EVAL and PDF_UNESCAPE suggest that the JavaScript is obfuscated and uses eval() and unescape() to execute arbitrary code. The extracted JavaScript artifacts, particularly 'legacy_pdfkit_stage_000.js' and 'deobfuscated.js', are large and exhibit script obfuscation indicators. This points to a pattern of a malicious PDF dropper that uses JavaScript to download and execute a secondary payload, although the specific payload and its destination could not be determined from the provided evidence.

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` `b28a3ca1b28bafdd5ba590efba1d8e94645dacd02d9ba3979ac960fd22adceb1`	pdf-javascript-stream	PDF /JS object 7 at offset 0x195	111 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` `6442e021b1142dd3f1b5fa50e7c7c35009879d4d08edabd45bfbc491ab0ba8db`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x273	16084 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` `3fdb10a7b768a0806b851e9bda1c308ecf953fb4ba7f5181cfd0877747cb2b51`	deobfuscated-js	PDF JavaScript deobfuscation pass	52573 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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