PDF malware analysis — malicious · 346aa0e64dc6570b

MALICIOUS

PDF

12.2 KB

MD5: ca8bf75dfadee3a445d565651b461a4d SHA-1: ee32e3aaa34f51029f6bfb2880612bb8e9979b0d SHA-256: 346aa0e64dc6570be10b323586d3f449eb99c20ca0f753b034a38d1375758a51

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript that is obfuscated and likely intended to exploit a vulnerability, as indicated by the 'CVE_2007_5659' and 'PDF_JAVASCRIPT' heuristics. The 'annotation_subject_callee_hex_stager' heuristic suggests a stager mechanism is present. The primary exploit appears to be related to the 'collab.collectEmailInfo' function, a known vector for PDF exploits.

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` `570b98ac3ffaf02595a9098f53dba277de50763b0fbbf26dbf86c583801c2786`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5238 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` `e812ad15f723bf897f1a9c9a6150737a3128b1df7250cacbd8e2d4e2fb3e2b31`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12344 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` `30606adf744e3de379c92d5562b8c4d455a21d966a3923642abb443b822eb18e`	deobfuscated-js	PDF JavaScript deobfuscation pass	70877 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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