PDF malware analysis — malicious · 01934ac841f4ed0f

MALICIOUS

PDF

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

MD5: cd60b247d3d740749dac7f619c332e2e SHA-1: 6ee6209b4b285b10506882297a3e8b2f99e476f2 SHA-256: 01934ac841f4ed0fa66de7f7ae63bee38dd1f65715d533524e55240170a96d47

310 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link T1566.002 Spearphishing Attachment

The PDF contains embedded JavaScript that is heavily obfuscated and utilizes unescape functions, indicating an attempt to hide malicious code. Heuristics and ClamAV detections confirm this is a dropper for a second-stage exploit. The primary function of the embedded JavaScript appears to be downloading and executing further malicious content, as suggested by the 'generic_stage_recovery' heuristic.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 9

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.Dropper.Agent-1532760 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1532760
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` `9a84a4e4f382558c62b44d7dca77c92bf7e5370d9d0bb0f01bcabb923b479ef3`	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` `f60364a03a98318aee1f6e292b69354bd432e6d27e9148e0764202728513405b`	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` `e6884e53e3bf656515db3e0d1c287765b6dc4d71fb7414409f2379c5699067fc`	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` `46160f57a85716680f6af08accbde22bfa49a6b8c65edd5c3fb6bc6980ac08da`	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` `77407f700df2c03bf58dda594147fb8dd88ec627f8904e3087e841a32d25d91c`	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` `3d1963903906c8edf72a68452107132a5e41d77967d2f8d9e3290de095e91386`	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` `932d6953f884b1c04e22bfc9e052470e2253bdd0264a37d6a9e7b0815bf2c0ce`	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` `5dff2308770e5f9f762e2aa5a434a9b34e0e9f9b8ab4592387f2b5ab2702d185`	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` `d9bad1c4519c93e9bcebc555177f84655234dfa880fdbd84138c0ee5189410c4`	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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