PDF malware analysis — malicious · 85369944c361768a

MALICIOUS

PDF

12.2 KB

MD5: ba9a9466f22e14e459c2e4095a82740e SHA-1: 404a0d1606a4365094d41f18ab0088dc0350915b SHA-256: 85369944c361768ab1330bf58ae78148784dfdbe16a1e1e4095075be029bdbd2

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link or Trusted Domain

The PDF file contains embedded JavaScript, specifically identified as a stager exploiting CVE-2007-5659 via the Collab.collectEmailInfo method. This stager is designed to decode and execute further malicious JavaScript. The ClamAV detection 'Pdf.Exploit.Agent-36063' confirms the malicious nature of the file, indicating it's a known exploit for PDF readers.

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` `4a0a9afcd62693802b0a33f7e5ce053bfef4e7ac451229bf6bfebbba3dead3aa`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5297 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` `9b19ae9c3ee8641774c4ad9d005c5b269bb51c5a43012b2e30295aeb62f1560a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12514 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` `d25941aa2f18439c05f0e1015f79165fe290085b967570b20a8a06ddefc4001c`	deobfuscated-js	PDF JavaScript deobfuscation pass	72711 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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