PDF malware analysis — malicious · 5e2770427cc900af

MALICIOUS

PDF

103.0 KB Authoring application: PDFill: Free PDF Writer and Tools

MD5: 19f497833d9bd4977281d10e31940ee5 SHA-1: 53c468a43d190c1e721243f64cbdc86bcd2a8479 SHA-256: 5e2770427cc900af0f0358d400fd08823735e9c955f3a49cbc2db75cf24490d5

312 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file exploits CVE-2009-0927 using embedded JavaScript. The JavaScript, after being deobfuscated, likely attempts to download and execute a second-stage payload from a remote location. The presence of exploit-related heuristics and ClamAV detection strongly indicates malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

Heuristics 10

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (matched in decompressed stream)
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.
ClamAV: Pdf.Exploit.CVE_2009_0927-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.CVE_2009_0927-1
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
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.
External URI info PDF_URI

PDF contains an external URL action
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.pdfill.com
- http://www.pdfill.com)/S/URI

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `5285db6086bcbe3a9fe9c8348712b2d5485dc7d893b947f74ad3018934ee7533`	pdf-javascript-stream	PDF /JS object 11 at offset 0x155E	98608 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `f3b765489e43d1e740249bbf0ad9409061744a5b7190231eae104bc542f67c33`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 11 at offset 0x155E	98600 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `0f3ea285bfc1b18f952e67a005dd5efd02c152ce4f1a529fed4556d08ff0c4da`	deobfuscated-js	generic stage recovery percent-decode from decompressed stream at 0x18FB5 at offset 0x18FB5	1788 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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