PDF malware analysis — malicious · 6cc24994396ebe4e

MALICIOUS

PDF

298.6 KB

MD5: 48b2630f34f1b279ff350955294b37bb SHA-1: 82208cb05d1b150cec6d9ce8d9b73572864bc959 SHA-256: 6cc24994396ebe4e356b2727fa7aea332fd85b8196fb98f2fa20f094ee18987a

338 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that utilizes unescape functions and constructs large strings, indicative of exploit code. This script is designed to trigger a PDF JavaScript exploit cluster, leveraging CVE-2010-2883. The ultimate goal appears to be the execution of an embedded Windows executable payload, as evidenced by the critical heuristic firing for 'PDF_EMBEDDED_PE_PAYLOAD'.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

Heuristics 10

Adobe Reader CoolType SING font exploit — CVE-2010-2883 critical CVE likely CVE_2010_2883

PDF embeds a TrueType/OpenType font with an actual SING table and pairs it with JavaScript heap-spray shellcode. This matches the public Adobe Reader CoolType SING exploit shape for CVE-2010-2883.
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
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` `bb5c7fdf712f11c55495e65f9eb2d16cc79d63ac46377aa278872cb0f74859a9`	pdf-javascript-stream	PDF /JS object 12 at offset 0x4A24D	1636 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_000_off00000337.bin` `3d68b6c65f2aff682ee36830025e4b0bbc1d6190719567586d71e5b17223b3fc`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x337	525856 bytes
`embedded_pdf_0002cd45.exe` `134290aa3b149f9e74c1f654ec13eb88ed554418fb8a3698b7f05058966f4d61`	embedded-pe	PDF decompressed stream PE payload at offset 0x2CD45	343058 bytes

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