PDF malware analysis — malicious · aaf5f64eaff6ad4b

MALICIOUS

PDF

11.7 KB

MD5: cd2d3adb4b92ea6598ae605eab1b7116 SHA-1: 518656dba076bb25e2af203823def797225581e3 SHA-256: aaf5f64eaff6ad4bbf4606be726ce61a2cf649399692922ea0e2c40b127c3cea

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains a critical heuristic firing for CVE-2007-5659, specifically utilizing the 'collab.collectEmailInfo' method to execute a JavaScript stager. This stager is heavily obfuscated but ultimately decodes and evaluates JavaScript, indicating a clear intent to download and execute a second-stage payload. The presence of multiple deobfuscated JavaScript files further supports this. The ClamAV detection also 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` `9ab3c15c6de3b9306ec42cff9e20b212bfa8a13e278564b64be66e0c2d0aadac`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4962 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` `ecf363f4beef5b73284082cedad662f7cb02e29f97907631ff43c7e82ad2dd5d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	11836 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` `3b9b551939f8c73c0b5b2c12e532be76bbd0764648e9fb070121883309f5b513`	deobfuscated-js	PDF JavaScript deobfuscation pass	81417 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.