PDF malware analysis — malicious · b6b2cc2339f2ea75

MALICIOUS

PDF

11.9 KB

MD5: fcf56c9e8af8319185090e3d354f8abf SHA-1: 751450cc62bbc3d0ec2b53c40acb9407badd6fe2 SHA-256: b6b2cc2339f2ea75211c019e3657f0a6b966b541e63234ad626257e6ca8e5662

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. Specifically, the 'CVE_2007_5659' heuristic indicates the exploitation of a known vulnerability using a JavaScript stager found within an annotation's subject. This stager is responsible for decoding and executing a secondary payload, as evidenced by the deobfuscated JavaScript artifact 'annotation_subject_callee_hex_stage_000.js'. The primary function of this script appears to be the retrieval and execution of further malicious code.

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` `0df291d69669aabea8d48539ff6e3447b14e49a861871000e6476334f075bd19`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	1011 bytes
`annotation_subject_callee_hex_stage_000.js` `a3b7572f416e7baaed78d2b61fa318e86a519bb48063822955be0568afe04b66`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	4951 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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