PDF malware analysis — malicious · d9889aa949cac1c9

MALICIOUS

PDF

12.3 KB

MD5: 0b1e5386f858c29fef88c45a99953d20 SHA-1: fa43be56724d89b392f3d276327cc2980604c027 SHA-256: d9889aa949cac1c97a85aae0603affe0915cbb92676f5553e199e1106b44ebaa

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF contains a critical heuristic firing for CVE-2007-5659, indicating the use of the Collab.collectEmailInfo method to launch a JavaScript stager. This stager, identified as 'annotation_subject_callee_hex_stage_000.js', is heavily obfuscated but ultimately decodes and evaluates malicious JavaScript. The primary intent appears to be the execution of arbitrary code via this exploit chain.

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` `38015dfb0a67dfd6ebd9a3ef7a590f13797b1ca60f6cc979c320f1da8fb202cc`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5181 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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