PDF malware analysis — malicious · 3cbaef208a2395d3

MALICIOUS

PDF

9.7 KB

MD5: 613247e49cdab87885c7b2472a7f3c3d SHA-1: 9b6904e4e29f99d99d600f86aaf8c5655e128b57 SHA-256: 3cbaef208a2395d35a3d86f176e82e6ca0e012b5e95b937105b5b477476bf889

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains heavily obfuscated JavaScript, detected by multiple heuristics including CVE-2007-5659 and ML classification. The primary function of the embedded JavaScript appears to be the staging and execution of further malicious code, as indicated by the 'hex_stager' and 'deobfuscated.js' artifacts. The exploit targets a known PDF vulnerability (CVE-2007-5659) to achieve code execution.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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` `11b03694c4e705ab29873cc5e2c55342ee498b376ac2dc5f05ce17018ef44c38`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	264 bytes
`annotation_subject_callee_hex_stage_000.js` `65837d17c29ae9e03cf16ee2ee56506acc47dd9cf51e893ba7693f31f52e8491`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5240 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` `bdd5ac65421930e4ad429c38069d3067e48e4b14d62b81d0b50626486e5a9357`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CC	12303 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` `300fda2e7b535b5931c2370be6788a9edb6f865db7e59d1ca6b10314dbd14f7b`	deobfuscated-js	PDF JavaScript deobfuscation pass	72242 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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