PDF malware analysis — malicious · 52dc6f6da6098157

MALICIOUS

PDF

13.0 KB

MD5: 4483e9ed44cc9e2fd891db0c2180c311 SHA-1: a5c7a2457d869a5513dd3a61d57d549d26b576a8 SHA-256: 52dc6f6da6098157587e859f3cc57dd7d73063344390cc73fe5ef08a7cc2c9f1

198 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link T1071.001 Web Protocols

The PDF file contains embedded JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The critical heuristic CVE_2007_5659 indicates the use of the 'collab.collectEmailInfo' method, which is a known technique for executing arbitrary JavaScript within Adobe Reader. This JavaScript is likely used as a stager to download and execute a second-stage payload, as suggested by the presence of deobfuscated JavaScript files 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js'.

Heuristics 6

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)
Annotation subject percent-decoding eval stager critical PDF_ANNOT_SUBJECT_MARKER_EVAL_STAGER

OpenAction JavaScript forces annotation enumeration, reads an annotation /Subject payload with getAnnots(), rewrites marker bytes into percent escapes, decodes it with unescape(), and dispatches it through eval. This is a high-confidence exploit-kit staging pattern. It is intentionally not mapped to CVE-2009-1492 unless getAnnots() itself carries the crafted integer or long argument shape for that vulnerability.
ClamAV: Pdf.Exploit.Agent-36064 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36064
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.
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` `a5c8f0f722df4dd9876a0087e1eee65bd3020c5995f94f6729f7e17f3f3677a0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	331 bytes
`legacy_pdfkit_stage_000.js` `d1544e79c5a2a6d131994e905e85705fa53ed0143dd7cf4d0db2de800b9ae72a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	12113 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `ca38ba259e55a9631dc2fffd152ddb58153c90552bcade24788842620e372133`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	5070 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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