PDF malware analysis — malicious · a7d27e9d3d930727

MALICIOUS

PDF

11.8 KB

MD5: efe441c61c6a5e8edd5e348daa6fb6a7 SHA-1: dc1dd86bc61585ea5aebbfa022a287d1b3ef6656 SHA-256: a7d27e9d3d930727da7915d38c7cbf01b9f72f72267717145dc778c01c1f1196

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1027 Obfuscated Files or Information

The PDF file contains a critical heuristic indicating the use of CVE-2007-5659, specifically exploiting the `Collab.collectEmailInfo` method to launch a JavaScript stager. This stager is heavily obfuscated and appears to be responsible for further malicious activity. The presence of embedded JavaScript streams and the specific exploit technique strongly suggest a malicious intent to download and execute additional payloads.

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` `e5f20172362ffa3c4f43938a2f37e6820aefaa2493efa67d6cd68d6e43730b7b`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5101 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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