PDF malware analysis — malicious · 0dc77bd2a4688edc

MALICIOUS

PDF

2.8 KB Created: 2008-09-23 12:49:56 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: e72dbf000ba26a8b4784c6b29514b515 SHA-1: 9cdc2a289dc7aa79d2c964574492bc7e58e3fbe7 SHA-256: 0dc77bd2a4688edc627424248fe1664067d452c153a0867791d1b24e624a3f8f

288 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that utilizes eval() and unescape() functions, indicative of obfuscation and exploit delivery. Heuristics confirm the presence of a JavaScript exploit cluster targeting CVE-2007-5659 (Collab.collectEmailInfo). The recovered JavaScript appears to be a stage recovery mechanism, strongly suggesting it's designed to download and execute a further payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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. (identified after JavaScript deobfuscation)
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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `648ad47960f68880cbdf5faa42c3d5d33aec78fd813b815fd43e02b91aedaabd`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CD	10287 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_000.js` `5abe79f076fdc8e51db85ba0bc91434b5c62c3363446842e9302452b7f441242`	deobfuscated-js	generic stage recovery hex-literal-bytes from JavaScript object 13 at offset 0x3CD	5122 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` `140027925438bad915fec65abbcd50fa1f7f8422fc7f31fc1fe18845ec55050b`	deobfuscated-js	generic stage recovery hex-literal-bytes -> split-literal-normalize from JavaScript object 13 at offset 0x3CD	4617 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s).

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