PDF malware analysis — malicious · 5cc748785f4adf50

MALICIOUS

PDF

300.0 KB

MD5: b1982d9da8cbd59584f321287b37c78a SHA-1: d2353541b62a13b3236950e204eb1dfdfc2fbe2f SHA-256: 5cc748785f4adf509f4cc988d1d731c5ceb9a5b96b042e3c51a685193bd65b03

318 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains JavaScript code that utilizes eval() and unescape() functions, indicative of obfuscation and potential exploitation. A critical heuristic identified an embedded Windows executable payload within a PDF stream. The JavaScript appears to be responsible for deobfuscating and likely executing this embedded payload, which is a common technique for delivering second-stage malware. The presence of XFA forms further supports the exploitation vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9396

Heuristics 10

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD

PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.bitstream.com
- http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/2.6/
- http://www.xfa.org/schema/xfa-template/2.6/
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/iX/1.0/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `2b4340ce013ed81e65f19cf464bafd9d3fc31349655ee3447fa011455c9c3d71`	pdf-javascript-stream	PDF /JS object 12 at offset 0x4A377	3488 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`stream_000_off0000044f.bin` `3d68b6c65f2aff682ee36830025e4b0bbc1d6190719567586d71e5b17223b3fc`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x44F	525856 bytes
`embedded_pdf_0002ce5d.exe` `134290aa3b149f9e74c1f654ec13eb88ed554418fb8a3698b7f05058966f4d61`	embedded-pe	PDF decompressed stream PE payload at offset 0x2CE5D	343058 bytes

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