PDF malware analysis — malicious · 427be78a0c1a0cda

MALICIOUS

PDF

12.3 KB

MD5: bcdc741a004262a8cbe3a739f64c0a10 SHA-1: 5e61515bd9c7a1782326fd460e8a2efca3a51245 SHA-256: 427be78a0c1a0cdafcb6780d029ed6f2406b81854c6ec29834b679ffd4532301

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains multiple embedded JavaScript streams and triggers heuristics related to CVE-2007-5659, specifically the Collab.collectEmailInfo function. This indicates an attempt to exploit a known PDF vulnerability. The presence of deobfuscated JavaScript files suggests the execution of complex malicious code, likely a stager designed to download and execute further payloads.

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` `22330642b4f7c441bb6c19a8c4ef70e7e17732511b7e263cc237e660b2724768`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5241 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` `8f3b18c3a8fbb2c47b4aac6505497b9fa6cc9f4b541f42f8055199bd52ebf1df`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12409 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` `1267beef92186444674567a92112b0bd5d210fe32482f7d3f601082b664b9b57`	deobfuscated-js	PDF JavaScript deobfuscation pass	76057 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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