PDF malware analysis — malicious · 22b0aef3c1a5cde1

MALICIOUS

PDF

12.0 KB

MD5: fd5c5a9edcd557dd3b2cb86f34a7540d SHA-1: f68e4fe907d60dfeaa7f735c3f93ad20d364b737 SHA-256: 22b0aef3c1a5cde1a91a8803d188df98187dcf43623cb017d466c1e31075e225

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is heavily obfuscated, indicating an attempt to hide malicious activity. The critical heuristic 'CVE_2007_5659: Collab.collectEmailInfo' strongly suggests exploitation of a known PDF vulnerability. The presence of multiple deobfuscated JavaScript files further supports the execution of complex malicious code. The ClamAV detection 'Pdf.Exploit.Agent-36063' confirms the malicious nature of the file.

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` `2517928871cc4a5c754d76a4508c10df8dbd536196d44938e4424ba4b61c05c9`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5108 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` `d21cd455f9d0c74724d128ec0f430b66a78e1be8bb75c1b2532dcd49901a1fb0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12218 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` `6326f63cc6495e0630dba66fc690b4eb3ff7ea7b19fbb5134c897ab4973c74a0`	deobfuscated-js	PDF JavaScript deobfuscation pass	68943 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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