PDF malware analysis — malicious · 44118bf3fcd741b2

MALICIOUS

PDF

12.5 KB

MD5: 9e0b3d14d38fa6e9c411588bc455b09d SHA-1: 646c5368893446c7efe979da39d886db6abd7d51 SHA-256: 44118bf3fcd741b2fb069af6dddc5657beb621453f78b443b9caf4e296ce548b

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF document contains embedded JavaScript, identified as a stager for CVE-2007-5659. This exploit is known to leverage the Collab.collectEmailInfo function to execute arbitrary code. The recovered JavaScript is heavily obfuscated, but the heuristic firings strongly indicate it's designed to download and execute a second-stage payload. The presence of ClamAV detection further supports its malicious nature.

Heuristics 6

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)
ClamAV: Pdf.Exploit.Agent-36179 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36179
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` `e89d7054d228dd0d7d4de9a02d1607a443ba297f326673115b5825c1b6cb184a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	823 bytes
`annotation_subject_callee_hex_stage_000.js` `0de98f1ebbdbfdafd560ea72b4d5e7110961b29ab76511f8625a32ef721900a3`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5381 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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