PDF malware analysis — malicious · 2769731cf2867184

MALICIOUS

PDF

9.9 KB

MD5: 9569197e5e563da84d9717c7e39ed4c8 SHA-1: 9ce2b0c710df606bc0e8a652f5b71d8b9dd83bc9 SHA-256: 2769731cf28671843cecb5d44b47a39102bdb63e22f95c719173a3cca15d0ed3

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious Link/Object

The PDF file contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT' and 'PDF_JS'. A critical heuristic, 'CVE_2007_5659', indicates the exploitation of a vulnerability related to 'Collab.collectEmailInfo' to execute a hex-decoded JavaScript stager. This stager is responsible for decoding and executing a secondary payload, as evidenced by the large 'deobfuscated.js' artifact. The primary intent appears to be the execution of arbitrary code via the PDF reader vulnerability.

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 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` `56c3ca3033dec00d3d9303f17ef28b7e06f44f9bd406fa5dfa06529c88124f1b`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5379 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `c0a842d6014ff73a10da0b19dfa66c1efdeeedefe5704da8cbf2e3b7933d3046`	deobfuscated-js	PDF JavaScript deobfuscation pass	75404 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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