PDF malware analysis — malicious · 4adaaaccdd8be8f5

MALICIOUS

PDF

12.7 KB

MD5: 9c3afc6bc4a116d4613994523bf293c9 SHA-1: 43fdd9bc8db25e08199e9081d051c95a4f85345c SHA-256: 4adaaaccdd8be8f5f480c09de3d2a6ca4447322f93aa000abcbde46aab64d89a

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. A critical heuristic, CVE_2007_5659, indicates the exploitation of a known vulnerability (Collab.collectEmailInfo) to execute a hex-decoded JavaScript stager. This stager, recovered as annotation_subject_callee_hex_stage_000.js, is responsible for decoding and executing further malicious payloads, likely leading to a second-stage infection.

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` `8b08bba40e9a16cde617de6072446845fefe9fbe16451f4e6770ea400933f9fc`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	739 bytes
`annotation_subject_callee_hex_stage_000.js` `f5b3ce5dce3f7e2dad02d4bd184d57bf85b2ae216090066426ee29871cfc6d4d`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5318 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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