PDF malware analysis — malicious · 101809f84cfe19cb

MALICIOUS

PDF

485.1 KB Created: 2008-03-17 20:52:33 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 7.0 (Windows))

MD5: 397ed1bd1f91c299c52a7f815d6c935e SHA-1: ea396e624047da74f67670a1ee384997126f6242 SHA-256: 101809f84cfe19cb16ca36c4ac4220cd63201b8fcb9aa88b3a3970a11206a103

260 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that is obfuscated and utilizes the unescape function, indicative of exploit code. Heuristics confirm the exploitation of CVE-2007-5659 (Collab.collectEmailInfo) and the presence of JavaScript exploit stages. The deobfuscated JavaScript appears to download and execute a secondary payload, suggesting a downloader or dropper functionality.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 10

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (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.
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`2` `55f78f9c9b59a08a4cc7757ec73c706b78cdecdde73ffe3b5ff2a5ea4cc47978`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x72E	2041 bytes
`javascript_obj0020_000.js` `e15edaec6d9b91e743afec610d77afb48eb2c8d21e7441faada5f7649b7bba61`	pdf-javascript-stream	PDF /JS object 20 at offset 0x77DB4	9794 bytes
`stream_004_off00077db4.js` `52433d48bd1c8319b1207193fd323b188b6da3832214c255f2200002cb60ad16`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x77DB4	4900 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `3624510ac3672a204e074a5a05bb51d5aa80085fb1c82b3e9aea2df7e75462a3`	deobfuscated-js	generic stage recovery null-collapse from JavaScript object 20 at offset 0x77DB4	4900 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `f830ce7ecfed887599594531b6595bf9d26a1503cd5b370a8bc9df6d71a73e66`	deobfuscated-js	generic stage recovery split-literal-normalize from decompressed stream at 0x77DB4 at offset 0x77DB4	4540 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s).
`generic_stage_recovery_002.js` `00a497edd4d40e7e0ac33f5fc1ee5548db435aa199da4de3918b180dd209ef34`	deobfuscated-js	generic stage recovery null-collapse -> split-literal-normalize from JavaScript object 20 at offset 0x77DB4	4540 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s).

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