PDF malware analysis — malicious · 22de11e300492968

MALICIOUS

PDF

37.1 KB

MD5: a2d0aff576cbc81030c16a767832a90a SHA-1: e510bdd1896e732c0840f96323f694e7978ecd7e SHA-256: 22de11e30049296899f7d26d79f01f8cf3b0830ed8a9edf799dd278bfd93c342

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link T1566.001 Spearphishing Attachment T1204.001 Malicious JavaScript

The PDF file contains embedded JavaScript and U3D content, triggering critical heuristics related to CVE-2007-5659 and a JavaScript stager. The analysis indicates that the PDF launcher uses specific functions to extract and decode a JavaScript payload from an annotation subject. This payload is then evaluated, suggesting the document is designed to exploit vulnerabilities and execute malicious code. The presence of multiple deobfuscated JavaScript files further supports this. The exact intent of the script is not fully discernible due to obfuscation, but it is clearly designed to execute arbitrary code.

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)
U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `dc37160715dd481d0bf49e7af5079aad16ed0e66896c1ae05ca27000b3e4454e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A2	259 bytes
`annotation_subject_callee_hex_stage_000.js` `bd267c06ca0f5a6c2f307753f2942d23223c0dafa5c95beb63bb340e87062036`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x151	5539 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` `9d738474789c3615064869169ef104a57ad1ef15336c452d8ce6b1a4de4942db`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2DB	13003 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` `5eb58d7836492f2a742e5849688b2c8b118d6fa4ea0f2f66f6ba452ff80c9970`	deobfuscated-js	PDF JavaScript deobfuscation pass	269700 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`u3d_00_off00002857.bin` `70cf2aead4823e6d2651c9281eed0aa967449da358f439efb9e8e707421175e0`	pdf-3d-stream	PDF U3D 3D stream at offset 0x2857	28021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.

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