PDF malware analysis — malicious · 29d116b2b95ea8ca

MALICIOUS

PDF

11.7 KB

MD5: ee24520dee9bd5dee44e6ac7e8668ffc SHA-1: 9c20778302aa3dc426ac3c7ab0c5fc946b23d883 SHA-256: 29d116b2b95ea8ca318a3430cafd340f9b5a5df9b18064bc100cddceb8be598a

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link or Document: Malicious Link T1204.002 Malicious Link or Document: Malicious Document

The PDF file contains embedded JavaScript that is obfuscated and decodes a hex-stager. The critical heuristic CVE_2007_5659 indicates exploitation of a known vulnerability in Adobe Reader via the Collab.collectEmailInfo method. The embedded JavaScript is designed to download and execute a second-stage payload. The ClamAV detection further confirms its malicious nature.

Heuristics 7

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-36063 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36063
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `eb39e2de4dbbc100de6d3e30aa43ff78fa075618862ba1ebba5151ea3a3b848d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	273 bytes
`annotation_subject_callee_hex_stage_000.js` `26c0c95fc1f33cc2ef8509e625188b15ea23fccf4ff446e82500113bfa16be25`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4893 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `4ba1f81e1bbc349cc6bf16189eb174ee1a6b678c981b89533993e5f3ec479927`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	11830 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `11e793009e93d9a76e0f15cceb6040e18c41a2fe9cbb7c061f0f9c3c712de0d2`	deobfuscated-js	PDF JavaScript deobfuscation pass	79528 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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