PDF malware analysis — malicious · 39369108e7709055

MALICIOUS

PDF

9.7 KB

MD5: 3675458c9f5aa4c0ca268dfd0821f35a SHA-1: f3219d59613aedc99f38da7677d6bb04a731266d SHA-256: 39369108e7709055eaaf07074a9e68237ff2db068c964fc4427777a2f0b8ee9d

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF exploits CVE-2007-5659 using a JavaScript stager embedded within an annotation subject. This stager decodes and executes further obfuscated JavaScript, as indicated by the 'annotation_subject_callee_hex_stager' and 'CVE_2007_5659' heuristics. The presence of multiple deobfuscated JavaScript files suggests a complex payload delivery mechanism. The exact final payload is not clear from the static analysis, but the exploit chain is evident.

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-13960 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-13960
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `11b03694c4e705ab29873cc5e2c55342ee498b376ac2dc5f05ce17018ef44c38`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	264 bytes
`annotation_subject_callee_hex_stage_000.js` `ae33d0b456d3771c6162e8b5fa11f3754f799c2b10ac77d1d0092ce38403cf09`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5313 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `bbc66a0daa3794d08a3d1a4e59948b3cf80c410bdc29595e1d0e2def98c2e826`	deobfuscated-js	PDF JavaScript deobfuscation pass	74284 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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