PDF malware analysis — malicious · 8d84ff5162328547

MALICIOUS

PDF

11.0 KB

MD5: 887008c1a6389f9f554e671cb26f5bf2 SHA-1: 3535dd14729fed5d95b11b720ac054f112b439a6 SHA-256: 8d84ff5162328547ef971b2cd98984519c66c23d7ee747871037db5082b363c7

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. A critical finding is the CVE-2007-5659 exploit targeting the Collab.collectEmailInfo function, which is used to decode and execute a hex-encoded JavaScript stager. This stager is responsible for downloading and executing a second-stage payload. The deobfuscated JavaScript is recovered as 'annotation_subject_callee_hex_stage_000.js'.

Heuristics 5

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)
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `83c89bafa116d9c91eff0b9ebda502f5bf0baa04c36fa774c6ebc2756ba3479f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	585 bytes
`annotation_subject_callee_hex_stage_000.js` `5052322d46e832428aeaa5d727af06c9fc14bdf13702399aa5ea24dd43497b2e`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5180 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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