PDF malware analysis — malicious · 243fe11bdf3cf89b

MALICIOUS

PDF

12.0 KB

MD5: c48d4c737b0f3d253b4df27ac36e2eee SHA-1: 940fac183779ca436bc6ac8286fc2a01edfacad9 SHA-256: 243fe11bdf3cf89bddf57f3cfb7044184bd373e2a4895bad1157b21858daa52b

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that is obfuscated and uses a hex decoder. The critical heuristic firing CVE_2007_5659 indicates the exploitation of a vulnerability related to the 'collab.collectEmailInfo' method within Adobe products. The embedded JavaScript acts as a stager, likely intended to download and execute a second-stage payload. The document body is unreadable, but the heuristics and script content strongly suggest a malicious intent to exploit a known vulnerability for 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.
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` `87fa17dae0650e2c60b049c3fc9cc3c251961d34a98060f5e19b759a5c7b1ee5`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5272 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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