PDF malware analysis — malicious · c2e137f14a884c19

MALICIOUS

PDF

12.5 KB

MD5: 8303090f3510b629c41ee0e5d20266d0 SHA-1: d55204f245f44b7b6035c8238e4265115e78855b SHA-256: c2e137f14a884c193bc46c0fe7b14cb4ef66ed38c397c7b1dcaa4b05532b44cc

198 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols T1204.002 Malicious File

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability through the 'Collab.collectEmailInfo' function. This JavaScript acts as a stager, indicated by the heuristic 'PDF_ANNOT_SUBJECT_MARKER_EVAL_STAGER', and is responsible for downloading and executing further stages, as evidenced by the extracted JavaScript files 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js'. The obfuscated nature of the embedded script and the use of a known exploit trigger suggest a downloader or dropper functionality.

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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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` `6f60a1053baafdc578f85eae84a2dc6d16775fbd66240d82cbfb7b4f4ff4e90a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	295 bytes
`legacy_pdfkit_stage_000.js` `accf41de25a5225e8554ab807a0d533ee65092a84d6be6b0b4971af9cf02550f`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E9	5285 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` `c76af931ff6f3c1cf436c34e1018ebb4245e59962023611982151c76aa9c07eb`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E9	12667 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).

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