PDF malware analysis — malicious · 108a11d5bcb80734

MALICIOUS

PDF

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

MD5: 6941d3d7f3e9e0ee2da3c71b3e4a3b48 SHA-1: c34022681fa89171fc803baeb2b120400bc1775f SHA-256: 108a11d5bcb80734fcba470f00496e9d814666d937e07d68e43f991b4e2abbbe

310 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that is heavily obfuscated and utilizes unescape functions, indicating an exploit attempt. The critical heuristic firings for PDF JavaScript exploit clusters and ClamAV detections confirm its malicious nature. The embedded JavaScript is designed to download and execute a secondary payload, as suggested by the generic stage recovery artifacts.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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.Exploit.Agent-22686 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-22686
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/

Extracted artifacts 15

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0003_000.js` `3a63aa1468610780740c9dc83aeeec5b08cb097e75c7162b2fbf08d5be27c95c`	pdf-javascript-stream	PDF /JS object 3 at offset 0x883	7299 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`javascript_obj0026_001.js` `ee6dc83aa72d587e7537f25f000004782c904b24090d639451e71b2603a7bbdc`	pdf-javascript-stream	PDF /JS object 26 at offset 0x20D6	14600 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: unlikely
`stream_011_off000020d6.bin` `1fecf78599121ffa956242e6ae29299505cb0982791e389ec1c96ad5908ae93d`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x20D6	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` `7e27c9dd3f52261d7c8018838b81bf9d134d85c09f1c213544554b371747af66`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 3 at offset 0x883	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` `52c46f746feb94c29ef31ef2d2a511a7ce738b9be01ff5dd371cf52625ca327d`	deobfuscated-js	generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0x883	20382 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` `06722ecc5a2d5c5c948ef799c8a71e99cd7c1ecccc15e21ff63255363b3613fe`	deobfuscated-js	generic stage recovery split-literal-normalize from decompressed stream at 0x20D6 at offset 0x20D6	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_003.js` `5d41a6961f14341c702c65e133d441c8d420b9c7dbb42e1a9f08b42b606dd5c6`	deobfuscated-js	generic stage recovery split-literal-normalize -> split-literal-normalize from JavaScript object 3 at offset 0x883	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_004.js` `ee7394fb02b35ec856df28f2593b5311bb4a174dfa533c756dd1aa5818511382`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from JavaScript object 3 at offset 0x883	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_005.js` `88af9cb98d5cf95c5cf59c280fc05ac93ca9316d3d84ab0fd7a4e35e35c4a4de`	deobfuscated-js	generic stage recovery null-collapse -> split-literal-normalize from JavaScript object 26 at offset 0x20D6	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_006.js` `c1b66eb0d7e4725f34ca21d3b4977e720e3bb37c58b852d250ee46308c8f0cd4`	deobfuscated-js	generic stage recovery null-collapse -> split-literal-normalize from combined JavaScript objects at offset 0x883	11565 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s).
`generic_stage_recovery_007.js` `8969833f039cacf46df63db50f09ef1dc7cb6b1bc8701430bb90b3ba22fca24e`	deobfuscated-js	generic stage recovery split-literal-normalize -> null-collapse from combined JavaScript objects at offset 0x883	13083 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s).
`generic_stage_recovery_008.js` `0cec90055be550ae7b53f48f4a88f4e2612022871fb289cb187537b9d4c06a7f`	deobfuscated-js	generic stage recovery split-literal-normalize -> split-literal-normalize from combined JavaScript objects at offset 0x883	20379 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`generic_stage_recovery_009.js` `126bcd60ac3b8e83fd98b07c37838b19d6668ba7c2faabe30c4225e92c42d8b0`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from combined JavaScript objects at offset 0x883	20374 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`generic_stage_recovery_010.js` `c1727c874d2c3794b4b9a807a3eec7168fb1aa7f31723c74af095d522f7131e7`	deobfuscated-js	generic stage recovery split-literal-normalize -> split-literal-normalize from decompressed stream at 0x20D6 at offset 0x20D6	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_011.js` `44368547edd2b56c707cd783fc2783c299f7a3d6ff2e26adb3565a0fc1144e28`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from decompressed stream at 0x20D6 at offset 0x20D6	5773 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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