PDF malware analysis — malicious · bb5d480f14be660b

MALICIOUS

PDF

12.1 KB

MD5: c4ad8ea0e854e069acc10cc27f3f8bcf SHA-1: 68b5eaf0fcd00944e935a89b463209dc8b6b7ebe SHA-256: bb5d480f14be660b9134f0946c21ea108efee2dcdb8871f2bb5e2a359343b5ff

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains multiple embedded JavaScript streams and triggers critical heuristics related to CVE-2007-5659 and a JavaScript stager. The 'CVE_2007_5659' heuristic specifically mentions the use of 'collab.collectEmailInfo' and a hex decoder applied to an annotation subject payload, indicating an exploit attempt. The presence of large, deobfuscated JavaScript files suggests the execution of complex malicious code, likely 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` `7a734aeedea61183498272f7fc40a3cb8e8b578a0f68cfb61f0c8e29b48da0c5`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5213 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` `6046f75c4d5c7f671a6531c3e529911154ef5a86a8b2898bf97d58a5ad5bae9d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12306 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` `191af3b2ed1ff9ac92e37928dccbe3f2629a64999b19e869c8f961211edb6cd3`	deobfuscated-js	PDF JavaScript deobfuscation pass	79810 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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