PDF malware analysis — malicious · 4f934304c28b3036

MALICIOUS

PDF

11.8 KB

MD5: 9cc4f051d4703c84de4365c52559c640 SHA-1: c1e802ec0b7d123f22b59535e38b9ae9bec4809a SHA-256: 4f934304c28b30360a2c15bf60408f4a55012fae881896dd21ea4b8f405a2145

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated and likely serves as a stager. The critical heuristic 'CVE_2007_5659: Collab.collectEmailInfo' indicates exploitation of a known vulnerability in Adobe Reader. The embedded JavaScript, particularly the 'annotation_subject_callee_hex_stage_000.js' and 'legacy_pdfkit_stage_001.js' files, is designed to execute malicious code, likely downloading and running a secondary payload. The ClamAV detection further confirms its malicious nature.

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` `5ae94597578b46a2df70dd7bcf2ebc52858c25bd941aa96998675126525edd7f`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4978 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` `fa0a41732b3908df52f64961dce94138c02701ff11d5cc07997a67099b9d4aef`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12011 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` `6c15435c75bd9cbe2b5d5f10504b0dcb88ba77a9797c25d87daa0bb100e3d489`	deobfuscated-js	PDF JavaScript deobfuscation pass	74429 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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