PDF malware analysis — malicious · 1cc68ea63aace100

MALICIOUS

PDF

41.5 KB

MD5: 73de763a38fd3bcae4f4abbb4132f39d SHA-1: 745590f68daab9fa5efbe91395d288b93101d8a8 SHA-256: 1cc68ea63aace100bd28e696e9a13b3929afd2c91745840e3c9e94a2f2910c65

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated and then decoded. The critical heuristic CVE_2007_5659 indicates the use of the 'collab.collectEmailInfo' function to launch this JavaScript stager. This stager is designed to download and execute a second-stage payload, likely for further malicious activity. The presence of U3D content also suggests an attempt to exploit older vulnerabilities.

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `af6f376e462eec7dfbd022a27879d23f8ef9e27c8626fb62b1c587ba12a722df`	pdf-javascript-stream	PDF /JS object 9 at offset 0x43F5	436 bytes
`annotation_subject_callee_hex_stage_000.js` `6304367969f7ebd3610c3092a389edfb57851144cfeaa00327a3e6175539554b`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1B9F	5601 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `6b6d284b25f3a65ddd63426c6e0ab438273fc6395161fdf2a7a90e0c06e8c944`	deobfuscated-js	PDF JavaScript deobfuscation pass	95944 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).

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