PDF malware analysis — malicious · 7c25f4279c396837

MALICIOUS

PDF

6.5 KB Created: 2009-05-06 20:45:24 +08:00 Authoring application: DocuCom PDF Core Library

MD5: d45ffc4ec0dae182f604dd07f568ccb3 SHA-1: 497c3532aff54f186da6489032a8af4fd7e77b81 SHA-256: 7c25f4279c396837ef82c1719b1070fe1f7c32a3ac85f738c1c4ef239a91c32e

370 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file exploits the CVE-2009-0927 vulnerability using embedded JavaScript. The JavaScript, after being deobfuscated, appears to download and execute a second-stage payload. The critical heuristic firings and ClamAV detection strongly indicate malicious intent, likely for delivering further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.Agent-35646 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35646
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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.
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.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 9

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `9d96470c14cb3777ea796d998c7e5b89fd2ee5331f762cf60a9164db7b7ffbde`	pdf-javascript-stream	PDF /JS object 4 at offset 0x891	14600 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: unlikely
`stream_003_off00000891.bin` `786bf592b8a8846674d419e34e5d22236b4a2d9bd25565839a074f57b182c618`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x891	7299 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `56eb4fc0a8b021a56bca31460e8cdee67c09ee17e3097760b1caa7b6092297f0`	deobfuscated-js	generic stage recovery split-literal-normalize from decompressed stream at 0x891 at offset 0x891	5781 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `56e375e06f71c51473be8330e72000596f0bb6c7cea9c995ad81ba80d02c056c`	deobfuscated-js	generic stage recovery null-collapse -> split-literal-normalize from JavaScript object 4 at offset 0x891	5783 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`generic_stage_recovery_002.js` `3c2717fd035a79baecb3dcdacfade7cdbd175e297fb552dc8ace5602bc83005f`	deobfuscated-js	generic stage recovery split-literal-normalize -> split-literal-normalize from decompressed stream at 0x891 at offset 0x891	5778 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`generic_stage_recovery_003.js` `38c7ff191ef98bfa5cdcffd4ac5c979b0c43a547ae2ffd218280fdb341a1c80f`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from decompressed stream at 0x891 at offset 0x891	5773 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`generic_stage_recovery_004.js` `b30836b8a02a62bc98784db4c342729d4e4093ae189ecb01c41b055627dc1119`	deobfuscated-js	generic stage recovery null-collapse -> split-literal-normalize -> split-literal-normalize from JavaScript object 4 at offset 0x891	5780 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`generic_stage_recovery_005.js` `b4aa5fd72a34d909191e43864b87e7645ad59c03de6d85a2b3cc09eabb1d49e1`	deobfuscated-js	generic stage recovery null-collapse -> split-literal-normalize -> percent-decode from JavaScript object 4 at offset 0x891	5775 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`generic_stage_recovery_006.js` `309448cc1caa8c7b97f71387df34f40d5d75c57e1d071e3ba3b81c5822f928d9`	deobfuscated-js	generic stage recovery split-literal-normalize -> split-literal-normalize -> percent-decode from decompressed stream at 0x891 at offset 0x891	5770 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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