PDF malware analysis — malicious · a4f5e59e939d7e5b

MALICIOUS

PDF

12.3 KB

MD5: 3bb108920ada44d960229c5f34ad07ef SHA-1: 867e6dd749dfd935dd564bb1f7b8066b352426d2 SHA-256: a4f5e59e939d7e5bac1da141728c16223fe10e0350ce9f7f0f10e199b9f27409

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, identified by the CVE_2007_5659 heuristic, which leverages the 'collab.collectEmailInfo' method. This JavaScript is further obfuscated and hex-decoded, acting as a stager. The primary function of this stager is to execute further malicious code, likely for downloading and running a second-stage payload. The presence of obfuscated JavaScript and the specific exploit technique points to a malicious PDF designed for initial payload delivery.

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.
Suspicious extracted artifact high 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.
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.

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
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`annotation_subject_callee_hex_stage_000.js` `860a0ea71d3ec6eecdde21fb8f9d10252eda93a14b54592d3cf8a48baedc8028`	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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