PDF / .TXT malware analysis — malicious · 88e78778560d5dc3

MALICIOUS

PDF / .TXT

12.6 KB

MD5: 6d8c8fe102670ac94a3169e03cede44e SHA-1: 58f6d929337ed03fb16452b431c845b13987d5b5 SHA-256: 88e78778560d5dc3648e2f1c01c309b6621b5609b6fdfd64170dd581950e143d

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, triggered by the 'collab.collectEmailInfo' function which is known to be vulnerable (CVE-2007-5659). The heuristics indicate that this JavaScript is used as a stager, likely to download and execute a second-stage payload. The presence of deobfuscated JavaScript files further supports this. No specific family could be identified.

Heuristics 5

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.
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` `bedd676af9bf2e3ca07f9e3a10d07bc561e9745801f30653ef176c0c1e7620a3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	336 bytes
`legacy_pdfkit_stage_000.js` `1678cc416339c12f4c9f91d2496bb5ddf0b079d9184b60ad59202121597cc79a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2EC	11758 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `516e619cb1c6cadadd27c1bf30e3e76c092e7460acc9d97fad15ff1aaf4247f1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2EC	4844 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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